Totally agree ledodgydave, cant't work out why I was so tired after having dd1 as she slept loads and could lay in/catch up sleep in the day.
Its only now that I am doing night feeds with dd2 and getting up around 6/6.30 with dd1 (who then wakes dd2) that I know the true meaning of tired (and dd2 is a fab baby and since shes been born (now 8 weeks) she has only ever had one night feed around 3am!)