 You know, if I'm just going into my sleep, it tells me at what point I exactly fall asleep. It shows me my heart rate through the night. And knowing your heart rate through the night is a good thing because some people might have sleep problems where they stop breathing in the middle of the night, and that's going to send your body into stress, and it's going to turn off your melatonin or reduce it, and you're going to lose out on REM sleep. And REM sleep, you don't need very much of it. You only need two to three hours, but most people are missing sleep.