I recommend a book for you ^ hope everyone can have a good night's sleep

After reading it, I feel good. Everyone is not having enough sleep. Check it out.
Be familiar with the relationship between sleep, sunlight, and temperature, and actively get quality sleep

The full name of the book is magic sleep-the secret to sleep the clock: how to sleep less but better (Powerful Sleep-secrets of the inner
Sleep clock: how to sleep less and have more energy than you ever had
Before)
Download:
Http://waiss.name/download/fantastic example
Original article:
Http://blog.donews.com/shinchris/archive/2008/03/02/1257689.aspx