Too Tired to Sleep

Does anyone else sit alone in the darkness, body too tired to move, yet mind speeding through a lifetime?  With thoughts whizzing past at an annoyingly attention-grabbing rate.  I have found sleep to be elusive.  This, in itself, is not new to me.  However, with my latest boy, I am worn out and actually long for sleep.  Now, unfortunately,  I find myself drawn to the computer at 3 a.m. when the little one has, once again, been fed and is resting.  Any normal Mom would try to pass out.  Yet, no matter how drained I may be, my mind won't let me sleep.  It would be different if I could nap with him during the day, but with four young kids, there is no napping.  So I find myself guiltily enjoying the silence of the night, wishing it would spread its tendrils through to sunrise, unbroken in its beauty.