Tonight in Carlisle
Perfect sleeping conditions
You'll sleep beautifully.
Sleep Score
9
⁄10
Excellent
Overnight low
12°C
Cool and sleepable
Stickiness
13°C
Neutral
Cooling by 4am
5.5°C
Cools nicely
Tonight's plan
Cold overnight — ideal for sleep depth if your bedroom stays above 16°C.
Windows
Open
Cool air tonight — let it in
Heating
Not needed
Cool but comfortably above the 16°C floor — duvet does the work
Bedding
Thick duvet + extra layer
Cold night — your body needs insulation to maintain core temperature
Fan
Not needed
Cool enough without — save the electricity
Based on temperature, dew point, wind, and overnight cooling
Why this matters
12°C is cool — ideal for sleep depth. Research shows deeper slow-wave sleep in cooler bedrooms, as long as the room stays above about 16°C. If your bedroom drops below that, sleep quality starts to decline again.
A 5.5°C drop between bedtime and 4am is substantial. This natural cooling aligns with your circadian rhythm — your body temperature dips in the early hours, and the environment cooling alongside it produces the deepest sleep of the night.
The week ahead
Tonight will be the best night, tue the worst.
Carlisle · next 7 nights
Tonight is a good one. Enjoy it.