My body has forgotten how to sleep

[GuybrushThreepwoodMP]

DD is one and has always been a pretty bad sleeper although we're starting to see a slight improvement. As I'm a really light sleeper, I wake up every time she does even if she settles herself. A result of a year of sleep deprivation is that I can't sleep. DD slept for a 5 hour stint last night which is great for her, but I still woke hourly. Every time DH does the night alone so I can catch up (which is usually at least once a week), I can't sleep longer than 1-2 hours at a time and I'm awake for the day at 4am.
I'm a busy mum and I started a new job recently and I don't have time to be this tired. Do I have to do some kind of sleep training on myself? Or just suck it up and accept that it's part of being a mum?

I like the idea of sleep training for knackered mums I don't know - but I have a similar problem. DD3 is 5, and has never been a good sleeper - we maybe get 1 night a week where she doesn't wake at all during the night, and like you, it has totally screwed up my sleep patterns. I feel exhausted during the afternoon, but wake up at night - end up going to bed late but then it's awful getting up in the morning.

I gave up alcohol a while back - thinking that would make me sleep better - but it hasn't helped. In fact, I've found it harder to get off to sleep at night.

Sorry, my post probably isn't much help! When you wake at 4 in the morning, do you wake up feeling anxious about not being able to sleep longer, even though you could?