Excellent advise - I also want to add that if you can get even 10 mins in your lunch break to lie down it helps so much - I went a sleep in the car for 15mins last week! I've also slept on park benches, under my desk, at the gym and in the park - you can get really creative when your so exhusted you just want to crash anywhere - word of warning - make sure you set your alarm on your mobile phone as you could sleep on a park bench for 2 hours..

if you can not det to sleep, lay down with your eyes closed and mediate for 10 mins, focus on your breath, positive affirmations, picture your baby growing etc.. for me, even a 10 min break with my feet up somewhere helps a lot...

good luck!