I used the '90 minute sleep rule' to stop morning grogginess — how it works

How sleeping in 90 minute blocks has helped me get rid of morning grogginess.
Hosted on MSN

My Apple Watch says I'm getting 90 minutes of deep sleep — is that enough?

I check my Apple Watch every morning to help me understand my sleep and one metric always stands out as worryingly low. Despite regularly clocking up over eight hours of happy snoozing, deep sleep ...
Los Angeles Times

Tired All the Time? Your Sleep Cycles (Or Sleep Calculator) Could Be the Key to More Energy

Ever wonder why some mornings you wake up ready to go, and others you feel like a zombie? The difference often comes down to when you wake up during your sleep cycle, and that’s exactly what a sleep ...
CNET

Alternative Sleep Cycles: How to Survive on 3 Hours of Sleep Each Night

Sleeping for 7 to 9 hours at night isn't the only way to catch some z's. Here are four alternative sleep cycles -- and they're pretty obscure. Annie Miller Medical Reviewer Annie Miller is a licensed ...
Daily Maverick

Waking at 3am every night? Here’s what may be going on

If you often find yourself awake at 3am, you're not alone. Here are some of the reasons that might be behind these awakenings ...