Guarantee a good night's sleep: Dr Michael Mosley shares amazing two-hour rule - Express

Dr Mosley spoke on BBC Sounds to discuss how just one thing can have a huge impact on your overall health.

On the show he discussed how walking outside in the morning can not only have an impact on sleep but can also help to improve one’s overall happiness thanks in part to its two chemicals produced, melatonin and serotonin.

“Light also helps to reset our internal body clock which tells our body to go to sleep and when to wake up.

“Exposure to light also suppresses the production of melatonin which is known as the hormone that encourages us to go to sleep.

“Bright light early in the morning will reduce your melatonin production straight off and starts to make you feel wide awake.

“It’s not only that light suppresses the melatonin, but it also brings your body clock forward so that in the evening when you want to go to sleep, your body is ready for it.

“In short, if you are struggling to go to sleep at night, it could be because you are not getting enough bright light, particularly in the morning.

“The earlier you have exposure to daylight the better the impact of the quantity and quality of sleep.

“It’s also thought that early exposure to light actually reduces the amount of time you wake up during the middle of the night to get a deeper and better night’s sleep

“If you’re awake when the sun is rising, although it might not feel like there is much light, there is a higher proportion of blue light or short-wavelength light which is one of the same things our receptors are particularly sensitive to and can have a positive effect.”

The body naturally produces melatonin, but researchers and the public have increasingly taken an interest in external sources of it, such as liquids or capsules, as a way to address sleep difficulties

“One of the odd things about your internal clock is that it doesn’t run 24 hours, it normally runs a little bit longer than that so one of the purposes of bright sunlight is that it resets the clock every morning and for some reason that seems to be particularly beneficial,” Dr Mosley added

“If we don’t reset our clocks in the morning because we have not had enough light our body clock will be off kilter

“It’s not just about how light has an effect on your melatonin levels, when you’re exposed to daylight it also triggers the release of a different chemical known as serotonin which is one that makes us feel good