compo, I think we all feel like that sometimes. It does get on top of you at times, usually when the baby is crying and you can't work out what to do, I find... Sometimes that over tired crying can take ages to settle - Baby Whisperer reckons it can take 20 mins...
Mabel, your DS must be so tired after being awake all that time in the night. Must say I do think that going downstairs can be a big mistake.. esp if you fall asleep on the sofa and toddler is wide awake!!!
Fraser slept last night from 11.30 to 7.02 without a peep! Although he was in his car seat, as we had a terrible time trying to settle him down last evening as he was really windy (culprit was cauliflower I think) - he'd settle for 1/2 an hour then cry again. Hope he doesn't do it tonight, as we have a friend babysitting so we can go out!
Still having trouble getting him to sleep for more than 45 mins at a time in the daytime... Oh well, can't have it all.