Yup, no secret to it - your body just copes. Dunno how.

We usually have about.... ummm.. 5 hours sleep here a night - and usually thats with two wake ups minimum - one from each kid. Every so often I find it absolutely impossible to get out of bed at 5/5.30 for DS - so DH gets up with him and I sleep in until 6.45 when DD normally wakes up. Then I do the same for him when he is dead to the world. Doesn't happen that often though.

It does make it easier if your partner gets up with the earlier riser - and you stay sleeping until the other one gets up.

Oh, and did I mention my main intake of liquid comes in the form of caffeine?