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Sleep experts agree it’s important to keep cool at night as your body (or ‘core’) temperature needs to drop by about half a degree for you to fall asleep.
The brain, driven by your internal body clock, sends messages to the blood vessels to open up and release heat.
‘Your core temperature is at its highest at 11pm and its lowest at 4am,’ says Dr Chris Idzikowski, director of the Edinburgh Sleep Centre and author of Sound Asleep: The Expert Guide To Sleeping Well.
‘If anything prevents that decline in temperature, the brain will wake itself up to see what’s going on, meaning you’ll struggle to get to sleep or you’ll have disturbed sleep.