I have just received the following e-mail this morning:
Seven Is Heaven
Seven appears to be the magic number when it comes to getting a good night's sleep.
A study recently revealed that people who routinely averaged 7 hours of sleep each night had the lowest mortality rates. Most people need between 6 and 8 hours of sleep each night, so listen to your body and get the amount of rest that feels appropriate for you.
There was me thinking everybody had the same mortality rate.