(Image credit: Future / Eight Sleep)

Type: Smart mattress cover

Sizes: 6 (twin–Cal king)

Sleep trial: 30 nights

Warranty: 2 years

Subscription: Yes (from $17/month)

Price (on sale): From $1,899 at Eight Sleep

Type: Smart mattress cover

Sizes: 3 (queen–Cal king)

Sleep trial: 30 nights

Warranty: 2 years

Subscription: Optional ($250/year)

Price (on sale): From $1,795 at Orion

Bear

Elite Hybrid Mattress

Type: Hybrid mattress

Sizes: 7 (twin–Split king)

Sleep trial: 365 nights

Warranty: Limited lifetime

Subscription: No

Price (on sale): From $1,298 at Bear

Just yesterday I was sweating through a scorching summer night and now when I climb into bed, it’s like stepping into an igloo. Either way is bad news for my sleep and can result in 3 a.m. wake-ups. No wonder all the best mattresses we’ve tried have passed rigorous temperature regulation tests.

The best cooling mattresses use heat dissipating materials to kick out night sweats and counteract heatwaves so you’re able to snooze soundly.…