if you toss and turn in your sleep, bad news for you. another thing to keep you up at night. sleep disruptions in your 30s and 40s can have a big impact on your brain health as much as a decade later. meg ter ril joins us now. it s never good news to do a sleep study at 6:55 in the morning on a morning show. what s interesting is is they looked at people in midlife. usually they look at people in older age and the effects on cognition. this study looked at 500 participates who was an average age of 40. they were only getting about six hours of sleep per night. they looked a at their sleep duration, sleep quality and the fragmentation of their sleep,