Many of us fall into bed exhausted after a long day expecting to have a good night's rest, only find ourselves awake in the middle of the night unable to sleep.
For those who suffer with insomnia, trying to overcome it by scrolling through your phone or simply tossing and turning in hopes of falling asleep only results in remaining awake for hours.
Dr Michael Mosley, who is best known for his dieting tips - and is now exploring the science of sleep - has a top tip for what to do when you wake up in the middle of the night.
How to fall asleep again after waking up
Michael Mosley recent sat down with ex-BBC Breakfast presenter Dan Walker and political reporter Adam Fleming on the Newscast podcast where they spoke about Walker's chaotic sleep routine.
According to Dr Mosley, the best thing to do if you're tossing and turning in bed without being able to sleep is just get up.
He explained: "The advice is broadly the 15-minute rule. If you are still awake after 15 minutes, get up and do something boring until you feel sleepy and then go back to bed.
"The rule is to associate bed with sleep and sex and nothing else. No Twitter, no TV, nothing else."
Addressing Walker's sleep pattern where he said he was high functioning despite once sleeping "no more than 24 hours over the course of the week," Mosley added: "I would say you're massively deluded. People think they're' fine, but they're not."
Sleep tips from Michael Mosley
Here are three more sleep tips from Dr Michael Mosley to help us get a full night's rest.
Invest in an eye mask
Dr Mosley suggests getting an eye mask to block out the sunlight. This is especially useful during the summer months, when people get 25 minutes less sleep on average due to bright mornings.
He said: "I'd advise getting a pair of eye shades, not very sexy in bed. The early morning light is what wakes you up. Unless you have fantastic curtains, it's likely that the light will come in and wake you up."
Stick to a sleep window
It's important to have a routine when it comes to sleep, especially regarding the time you wake up and go to bed. You should aim to sleep and wake up within the same time frame every day.
This is called your sleep window and following this pattern will keep your sleep consistent, resulting in better sleep efficiency, which is the proportion of time you spend asleep rather than lying awake.
No distractions
Michael Mosley advises that your bedroom should be for sleep and sex - nothing else. So, he suggest you get rid of the TV in your bedroom and leave your phone outside the bedroom to resist temptation.
Activities like using your phone or watching television will excite your brain and keep you awake, so try to avoid these activities in the hours leading up to your bedtime.
