Tonight in Southwark
Poor sleeping conditions
Difficult night ahead.
Sleep Score
3
⁄10
Difficult
Overnight low
23°C
Tropical — brutal
Stickiness
15°C
Slightly muggy
Cooling by 4am
4.7°C
Cools nicely
Tonight's plan
Tropical night ahead — temperatures won't drop enough for comfortable sleep.
Windows
Crack open
There's a breeze tonight (11 km/h) — cracking a window lets moving air help, even though outdoor temp is warm
Heating
Off
Warm enough — heating would make it harder to sleep, not easier
Bedding
Sheet only
Cotton or linen — synthetic traps heat against your skin
Fan
Optional
Natural breeze may be enough if windows are open — try without first
Based on temperature, dew point, wind, and overnight cooling
Why this matters
At 23°C overnight, your bedroom will sit well above the 16–18°C range sleep researchers recommend. Your body needs to drop its core temperature by about 1°C to initiate sleep — at these temperatures, it can't do that efficiently without help.
Dew point is 15°C — not extreme but enough to make the warmth feel stickier than the temperature alone suggests. The gap between temperature and dew point is what determines whether the air feels fresh or muggy.
The week ahead
Tue will be the best night, tonight the worst.
Southwark · next 7 nights
Next great sleep night: Sat.