“Why do you wake up in a bad mood for no reason – and do men really run a hormone cycle in a single day?”
Waking up in a bad mood: wrong side of the bed or biochemistry?
Waking up in a bad mood is rarely about the wrong side of the bed: cortisol, sleep and testosterone explain why men wake up low for no reason.
The short answer
- Waking up in a bad mood usually comes from the cortisol surge after waking, a night of too little or broken sleep, and what your head makes of that body feeling.
- Sleep really does re-sort emotions. That is why "sleep on it" is good advice – as long as the night gets to do its job.
- Men have a measurable 24-hour testosterone rhythm. It is not a monthly cycle in miniature, and it explains moods less well than its reputation suggests.
What "the wrong side of the bed" really describes
The saying treats a bad mood in the morning as bad luck. In fact the morning is the most hormonally restless part of the whole day. In the minutes after you wake up, the body ramps up two systems at once: the stress hormone cortisol and, in men, testosterone, which is at its daily peak right then.
So if you wake up in a bad mood, you did not pick the wrong side of the bed. You are feeling a body that is starting under full load, and a head that is looking for an explanation.
What happens in the body at night
Testosterone is topped up during sleep
Most of a man's daily testosterone release happens during sleep. That is how the sleep researchers Rachel Leproult and Eve Van Cauter put it in their widely cited paper in the journal JAMA. The level climbs through the night and peaks somewhere between 5:30 and 8 a.m., depending on the study. Roughly twelve hours later it is at its lowest.
Dream sleep takes the edge off feelings
In REM sleep, the dream phase, the messenger noradrenaline is turned far down in the brain. A team led by Matthew Walker at the University of California, Berkeley, showed about 35 young adults the same 150 emotionally charged pictures twice, twelve hours apart. Those who slept in between reacted far more calmly the second time, and the amygdala, the brain's alarm centre, was quieter in the scanner. Walker calls it a kind of overnight therapy.
The sleep physician David Kuhlmann objected that the conclusion goes a little far: dreaming is no cure-all for emotional stress. As a mechanism, though, the finding is well supported.
Why "sleep on it" works
Wired when you go to bed, more sober in your judgement the next morning: that is the practical side of the same research. Two effects come together.
- The excitement is worked off. What you lived through is processed in a phase when the brain's stress chemistry is turned down. The memory stays, the punch fades.
- A tired brain overrates rewards. In a review by Walker's group, the reward centres respond more strongly to gains after sleep loss, while losses carry less weight. For a purchase decision at 11 p.m., that is a bad combination.
The old advice is less folk wisdom than applied sleep science. It does assume that the night can actually do its work.
When the night does not do its job
Too little sleep: the alarm centre turns up
In an experiment from Berkeley and Harvard, 26 healthy people stayed awake for about 35 hours. Afterwards their amygdala reacted to negative images around 60 percent more strongly than in rested participants. At the same time the link to the prefrontal cortex, which normally puts feelings in context and brakes them, was weakened.
An ordinary short night is not that extreme. The direction is the same, though: less sleep, more alarm, less brake.
Too little sleep also lowers testosterone
Leproult and Van Cauter had ten healthy men of about 24 sleep less than five hours a night for a week. Daytime testosterone fell by 10 to 15 percent, most clearly between 2 and 10 p.m. The men reported less well-being and energy with every day. The study was small, but the result is clear.
Alcohol the night before
After an evening of drinking, many people wake up not just with a headache but with anxiety and guilt. Researchers at Swinburne University sum up the studies this way: hangovers consistently come with more anxiety, stress, guilt, irritability and sadness. The reason is a rebound in the brain. Alcohol boosts the calming messenger GABA and dampens the stimulating glutamate. When the effect wears off, the balance tips the other way. On top of that, alcohol disrupts REM sleep, the very phase that is supposed to take the edge off feelings.
Waking up feeling guilty for no reason: how does that happen?
This is the most interesting part, because biochemistry and psychology mesh here.
Step 1: the body sounds the alarm
In the first 30 to 45 minutes after waking, cortisol rises steeply. Specialists call this the cortisol awakening response. It is stronger when you expect stress in the day ahead. In an everyday study of 42 young adults over five days, the strain people expected in the evening predicted the cortisol rise the next morning. A sleep-lab trial with 40 adults found the same, even though the participants had not slept worse. Not every study finds this link, but most do.
So the body prepares for the day before the head is awake enough to know what for.
Step 2: the head looks for a reason
A pounding heart, tightness, inner restlessness: this body feeling resembles what you know from guilt or fear. The brain does not like feelings without a cause, so it supplies one. It digs through memory for something that fits, and there is always something: an unanswered message, a sentence from last night, a task you put off.
This reading is our interpretation, not a single study. But it fits what sleep research shows: in the morning after a bad night, the alarm centre is especially touchy and the brake in the prefrontal cortex is still weak.
The feeling is real, the reason is often supplied afterwards.
Step 3: leftovers from the night
If you wake out of a dream, or after too little dream sleep, you carry the unprocessed mood into the day. The morning then feels as if something had happened, when in fact only the night's processing was cut short.
Do men have a hormone cycle, just compressed into one day?
You read the claim often, for example in a guide from the German health insurer DAK: men go through every day, in a weaker form, what women go through once a month. What is in it?
What is true
The daily testosterone rhythm is real and not small. In a British study, 18 men had blood taken every 30 minutes for a full day. From peak to trough, total testosterone fell by at least 43 percent in all of them. A large part of that drop comes surprisingly early: a saliva study found that around 60 percent of the daily decline happens in the first half hour after waking.
| Time of day | What happens in the body | Source |
|---|---|---|
| Night | Testosterone is mostly released during sleep; noradrenaline is low in REM sleep | Leproult & Van Cauter; Walker |
| Waking to about 45 minutes later | Cortisol rises steeply; testosterone at its daily high (about 5:30 to 8 a.m.) | Kramer et al.; Brambilla et al. |
| Morning to afternoon | Testosterone falls, fast at first, then more slowly | Diver et al.; saliva study 2015 |
| Evening | Testosterone at its low, about twelve hours after the peak | Brambilla et al. |
What is not true
- It is a rhythm, not a cycle. The female cycle has clearly separate phases with different hormones over roughly 28 days. In men, the same curve of one hormone repeats every day. A urologist puts it this way in the German magazine Fitbook: strictly speaking, men have no cyclical hormone pattern like women, but they do have a 24-hour rhythm.
- The curve does not explain the morning mood. If low testosterone meant low mood, men would be at their most irritable in the evening and in top form in the morning. But the wrong side of the bed happens in the morning, at the testosterone high. That suggests cortisol, sleep and what you expect from the day shape mood more than the testosterone curve does.
- The monthly cycle is no mood timetable either. A review looked at 47 studies in which women noted their mood daily. Eighteen found no link to cycle phase at all, and only seven found the classic pattern of low mood before the period. That does not mean cycle-related complaints do not exist. It only means the comparison "women monthly, men daily" is too simple on both sides.
Our verdict: half right. Men have a clear daily hormone rhythm. That it produces mood swings like a scaled-down monthly cycle is not supported by the evidence.
What you can do about a bad mood in the morning
- Sleep before everything else. Seven to eight hours is the most effective lever for testosterone, the alarm centre and mood at once.
- Do not interpret the feeling straight away. If you know the first 45 minutes are shaped by cortisol, you do not have to hand the guilt a story. Get up, light, water, movement, then judge.
- Defuse tomorrow tonight. Expected stress drives morning cortisol. Three lines on what is coming tomorrow and what the first step is take work off your head.
- Count alcohol honestly. A rotten morning after three beers is chemistry, not a verdict on your character.
- Put big decisions in the late morning. Not at 11 p.m., and not in the first minutes after waking.
When it is more than a bad morning
Psychiatry knows the pattern of mood that is worst after waking and improves through the day. It can be an early sign of depression. If you wake up low, drained or full of guilt almost every morning for two weeks or longer, talk to your doctor. This article does not replace medical advice.
Bottom line
Nobody gets out of bed on the wrong side. Waking up in a bad mood is the result of a night that did not finish sorting feelings, a body that starts the day on cortisol, and a head that invents a reason for it. The male hormone rhythm is real, but it explains moods less well than its reputation suggests. If you want to wake up better, do not start with testosterone. Start with sleep. And if the mood tips at the breakfast table: how to argue without starting a war.
FAQ
Why am I in a bad mood in the morning when nothing happened?
Usually the cortisol rise after waking, too little or broken sleep, and stress about the day ahead come together. The body feeling comes first, and the head supplies the reason afterwards.
Why do I wake up feeling guilty?
Inner restlessness in the morning feels much like guilt or fear. It is especially common after alcohol, because the brain compensates for the dampening effect and dream sleep was disturbed. If the feeling lasts for weeks, see a doctor.
Do men have a hormone cycle?
Not a cycle with phases like women. Men have a 24-hour rhythm: testosterone is highest in the early morning and lowest in the evening.
When is testosterone highest?
Between 5:30 and 8 a.m., depending on the study. That is why doctors measure testosterone in the morning.
Does sleeping on a decision really help?
Yes. During sleep, experiences lose emotional force, and a rested brain weighs gains and risks more evenly than a tired one.
Sources: Brambilla et al., diurnal variation of testosterone (J Clin Endocrinol Metab, 2009) · Diver et al., diurnal rhythms in young and middle-aged men (Clinical Endocrinology, 2003) · Saliva study on the post-waking testosterone decline (Adaptive Human Behavior and Physiology, 2015) · Leproult & Van Cauter, sleep restriction and testosterone (JAMA, 2011) · Kramer et al., stress anticipation and the cortisol awakening response (Psychoneuroendocrinology, 2019) · Elder et al., anticipated demand and cortisol (Journal of Sleep Research, 2018) · Yoo et al., sleep deprivation and the amygdala (Current Biology, 2007), press release · National Geographic on Walker's REM sleep study (2011) · Review on sleep and emotional brain function, excerpt · Rothman & Aitken, Swinburne University, on anxiety and guilt after drinking (RNZ, 2025) · DocCheck Flexikon: Morgentief (German) · Romans et al., mood and the menstrual cycle (Gender Medicine, 2012) · Fitbook: do men have a cycle? (German) · DAK: the male cycle (German). This text summarises published studies and is not medical advice.