What are the effects of a sleepless night on the body?

A sleepless night is hard on the body, because sleep is when tissues repair, memories are consolidated and hormones are restored. After a sleepless night or only two hours’ sleep, you may experience irritability, sleepiness, amplified negative emotions and a sense of “floating” or being in another reality. Your circadian rhythm is also disrupted, which has repercussions over the following days.

Can regular sleepless nights affect your health?

Yes. Going without sleep on a regular basis disrupts the circadian rhythm and makes you more prone to certain illnesses, including cardiovascular disease, diabetes, hypertension, anxiety and depression. Protecting the quality and regularity of your sleep is therefore important for long-term health.

How does caffeine affect sleep?

Caffeine has a direct impact on the ability to fall asleep and on sleep quality in general. Drinking coffee within about six hours of going to bed can reduce sleep by roughly an hour, and may also cause night-time waking and difficulty falling asleep. The exact effect depends on your individual sensitivity to caffeine, but avoiding coffee for at least six hours before bed is recommended.

Why does alcohol disrupt sleep?

Drinking alcohol in the evening can have two effects: a small amount can make the brain hyperactive and delay sleep, while a larger amount may help you fall asleep quickly but harms sleep quality. As the body eliminates alcohol, it tends to increase snoring and the need to urinate, makes sleep shallower and less restful, and raises the risk of perspiration, headaches and dry mouth. Regular alcohol consumption therefore has a real negative impact on sleep.

Is it better to pull an all-nighter or sleep for two hours?

Neither option is ideal. Sleep is governed by cycles lasting around 90 minutes, and waking after two hours risks interrupting a new cycle, making it very hard to get up. If you must choose, it is better to sleep for 1.5 hours rather than 2, as completing a full cycle is preferable. A short sleep that respects the cycle length is still better than a completely sleepless night.

Why is good-quality sleep important for health?

A good night’s sleep is essential for good health, allowing the body to recover both physically and psychologically. People spend about a third of their lives sleeping. By contrast, insomnia, sleepless nights or a lack of sleep have a noticeable impact on daily life.

How do sleep cycles affect how rested you feel?

Sleep is generally made up of cycles of around 90 minutes each. Waking in the middle of a cycle rather than at its end can make getting up particularly difficult. Everyone is different, but completing full cycles is helpful, and depending on the timing it may even be better to stay awake than to sleep for only about two hours.

How can you optimise a short night’s sleep?

Because sleep runs in cycles of about 90 minutes, the aim is to wake up at the end of a cycle rather than in the middle of one. Ideally you should plan your sleep in 90-minute blocks — for example 1.5, 3 or 4.5 hours. It is the number of complete cycles that matters most, not simply the total number of hours.

Sleep disorders in Switzerland: book an appointment online

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Sleep disorders in Switzerland: book today an appointment online

What are the effects of a sleepless night on the body?

Can regular sleepless nights affect your health?

How does caffeine affect sleep?

Why does alcohol disrupt sleep?

Is it better to pull an all-nighter or sleep for two hours?

Why is good-quality sleep important for health?

How do sleep cycles affect how rested you feel?

How can you optimise a short night’s sleep?

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