I suffer it too Bath you definitely aren't alone!

THe way i (try to) combat it is by having running shortlists of things that i MUST do.

For instance everyday for DD i MUST:

-Make sure she has good nutritious food.
-Make sure she gets out in the fresh air, unless it is really TERRIBLE weather (if it's just raining we go a walk with her in the buggy to keep dry).
-Make sure she's read to several times.
-Make sure she doesn't feel neglected - she's quite vocal and can accept "mumma's busy honey" once or twice but the third time i have to drop whatever it is and give her attention.
-Take her to a toddler group once a week (usually we do 2, but 1 is my minimum)

for the house i MUST:
-Do the washing (once it mounts up it's terrible to sort out)
-Do the dishes (as above)

for me i MUST:
-Get on BB/internet at least a little (i'm a SSAHM - today i'd not have had ANY adult conversation if it weren't for the internet)
-Run or get to the gym, (unless it's Friday)

I tend to mix and match and mentally tick them off. If i get to bedtime without having read to her enough we have 4 or 5 books at bedtime. If i get to the end of the day and haven't done the dishes i put them to soak overnight and do them before breakfast the next day. I also don't always count playing with DD as "play" for me because often at 8.15am, as horrible as it makes me sound, i'd rather drink a coffee and stare out of the window than crawl around the floor with 3 teddies on my back...not always, but often. LOL.

I am excited to live with DP as i know his working hours will give me more structure (i.e. planning at least my getting up and cooking and so on around his day, and once i'm working again when DD is in nursery i'll have to get up and run in the early mornings to fit them in, and will have to be back for breakfast and to get a shower and get DD ready and so on and so on) and that will hopefully help. I don't ever get to lie in and always put DD to bed at 7.30pm but i can totally see how single SAHM's could end up letting their lifestyle slide and slide and slide...

Bx