I am so so tired all the time, I felt great at this stage of my first pregnancy. Toddler is 20 months and still waking once a night, DP and I share the night waking and take it in turns to do the early mornings. He works full time and I do some part time work at home some evening and weekends (its not a steady flow of work or I would hire childcare). Yet I'm absolutely wiped. Normal?