Morning Types Crash Faster Than Night Owls, Study Says [Sleep] →
According to the study as reported by Scientific American:
An hour and a half after waking, early birds and night owls were equally alert and showed no difference in attention-related brain activity. But after being awake for 10 and a half hours, night owls had grown more alert, performing better on a reaction-time task requiring sustained attention and showing increased activity in brain areas linked to attention.
