By Karen Springen
Stay up and read this tonight (you’ll thank us in the morning!)
1. To function best, you need to get eight hours.
There's nothing magic about that number. Everyone has different sleep needs, and you'll know you're getting enough when you don't feel like nodding off in a boring situation in the afternoon, says New York University psychologist Joyce Walsleben, Ph.D., co-author of A Woman's Guide to Sleep .
2. If you can get it, more sleep...