Yes it is. When a person can not see light the biological clock sets itself
as it pleases. It remains on a 24 hour cycle. But, it doesn't set itself
according to nature's pattern of light and darkness. To remedy this some
take Melatonin to try to correct this.
----- Original Message -----
From: "Sharon Hooley" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 06, 2009 5:39 PM
Subject: Re: sleepy time guys and gals
>I wonder if this is a common problem among blind folks like us?