Very, very tired

No sleep for almost two days now.  The exhaustion is really starting to impact my thoughts and mood.  I've been drinking coffee all morning but it's not helping.  Got to get out the door soon to a work meeting.  It's over an hour drive (hopefully I won't hit any traffic) and it'll last several hours.  I need to be "on" ... perky, peppy and happy.  When I feel like this all I really want to do is take a long walk off of a short pier.  Ugh... I've gotta go.  Don't want to ... but have to.  Hopefully tonight I'll be so exhausted that I won't have any choice but to fall, and stay, asleep.