I have an office job too but have never been a morning person and that was 10 times worse when I was pregnant. I was basically comatose till about 11am and then came good. Ended up working till I was 37 weeks pregnant but I didn't have to endure the train commute as work paid for taxis to and from because I had pelvic instability too so couldn't really walk without being in agony. So all I had to do was shuffle to the loo and people brought me lunch/tea/coffee to my desk. Easier than being at home!