... while watching TV, but then can’t sleep when they go to bed.
During a nap, you dissipate some of your sleep pressure. The brain can only produce so much sleep over 24 hours. If you use some of it up on snoozing in front of the telly, there is less left for the night. 
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Why People fall asleep on the sofa

We are paralyzed during REM sleep, and we believe that this is so we don’t act out our dreams. A small percentage of the population wake up in REM sleep, but the brain forgets to wake the muscles so they get this scary state where they are paralyzed but awake. It is completely harmless, although it can feel terrifying.

Sleep paralysis

Sleeping pills depress the central nervous system, so they feed into biochemical changes that occur in the brain, causing you to drop off to sleep. Unlike the brain circuitry, they wash the entire brain in these chemicals so there are other unwanted effects. They reduce the amount of time you spend in the deepest stages of sleep, and people get used to them and require increasing doses. It is better to look at the underlying cause of your sleep problem, which is often psychological.

Sleeping pills

<div><div>Power-napping is very good for you. Ideally, you should nap for 10-20 minutes between 12 noon and 3 pm. </div></div>
Napping must be natural because so many cultures have siestas. But often the desire to nap in adults comes from insufficient sleep during the night. There are reports showing that excessive napping can be associated with negative health outcomes

Napping

It is important to leave at least a couple of hours between eating and sleeping. There is a whole raft of so-called sleepy foods – anything containing tryptophan, serotonin, melatonin, magnesium, calcium, potassium – often eaten in the hope they will aid sleep. If you do want to eat these foods, do it because it’s a nice ritual, not because you need it to sleep.

Eating before bed

A lot of the symptoms associated with a hangover are a product of sleep deprivation.Alcohol affects our ability to get into what is known as rapid eye movement (REM) sleep, the bulk of which occurs in the last two-thirds of the night. As a rule of thumb, it takes about an hour to metabolize one unit of alcohol, so if you have a 250ml glass of wine at 7 pm it will mostly be out of your system by 10.30pm.
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How alcohol affects sleep

There isn’t a cure. People who sleepwalk usually are advised to keep their room safe by locking windows and doors, and to maintain what’s called good sleep hygiene: keep to a regular sleep routine, turn mobile phones off, avoid stimulants, and so on. Sleepwalking can often occur as a result of poor or disrupted sleep.
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A cure for sleepwalking

<ul><li>There is some evidence that suggests that if you sleep excessively, your risk of mortality increases, but it remains controversial. </li><li>Teenagers naturally have a delay in their sleep phase because the production of the hormone melatonin (which aids sleep) gets released later as a product of puberty. This means they naturally want to go to bed and get up later.</li></ul>

The Possibility of Sleeping too much

The optimal way to wake up is naturally. If someone is hitting the snooze button, it suggests they are not getting enough sleep or they are sleeping at the wrong time for them. If you are a habitual snooze button user, reset your alarm to the later time and get more consolidated sleep.

Using the snooze function

Acceptance is important.If you don’t fall asleep within 20 minutes of going to bed, get up, go to another room and do a calming activity, then go back to bed. If you are lying in bed unable to sleep, your brain will soon start associating lying in bed with being awake.

The cures for insomnia

Dr Guy Meadows is a specialist in chronic insomnia and clinical director of The Sleep School, London Dr Guy Meadows is a specialist in chronic insomnia and clinical director of The Sleep School, London Derk-Jan Dijk is professor of sleep and physiology at Surrey's Sleep Research Centre Gillian Twigg is principal clinical scientist at the sleep centre at Imperial College Healthcare NHS Trust Dr Guy Leschziner is a consultant neurologist at the sleep disorder centre, Guy's and St Thomas' hospitals, London Guy Meadows A lot of the symptoms associated with a hangover are a product of sleep deprivation.

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Cognitive Behavioral Therapy for Insomnia (CBT-I) | Sleep Foundation