What you should know about getting a good night's sleep, from a company that has analyzed 1 million nights of sleep data

Dreem, a tech company that aims to help people sleep better, collected data from 1 million nights of sleep.

Dreem, a tech company that aims to help people sleep better, tracks brain activity, heart rate, breathing and movement of its customers with its headband called Dreem 2. Couples can have different preferences about how they like to sleep, including types of sheets, temperature of the bedroom and time they go to bed, said Jared Minkel, a clinical assistant professor at Brown University and director of adult behavioral sleep medicine at Rhode Island Hospital."People aren't really that good at sleeping together and the older you get, the worse it gets," Minkel said.

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