Utahns among the latest to sleep, per Apple Watch data

The big picture: Most people aren't getting the recommended 7 to 9 hours of sleep per night, which impacts mood and health.

• The national average is 6 hours and 40 minutes.

What they found: Participants with the most consistent bedtimes throughout the week slept for 40 more minutes and spent 36% less time awake during sleep periods, compared to other Apple Watch wearers.

• They also averaged 57% more time exercising.

What they're saying: "The most important thing" for sleep hygiene is going to bed at the same time daily, sleep medicine physician Shalini Paruthi tells Axios.

The intrigue: Hawaiians were the earliest to bed (11:06 p.m.) but also slept the least (6 hours, 31 minutes).

• D.C. residents had the latest bedtime (11:56 p.m.) followed by New Yorkers (11:53 p.m.).

Go deeper: How to get more sleep