After a sleepless night, those foggy, drifting moments may be more than fatigue — researchers at MIT say your brain might be cleaning itself mid-day. Their study, published this week in Nature Neuroscience, reveals that brief lapses in…

After a sleepless night, those foggy, drifting moments may be more than fatigue — researchers at MIT say your brain might be cleaning itself mid-day. Their study, published this week in Nature Neuroscience, reveals that brief lapses in…