2nd trimester energy - spare some?

Mónica • Miscarriage June 2018. Expecting rainbow November 2nd

I'm almost reaching my 15th week and feel absolutely exhausted. No matter how much sleep I get. Normally I would feel energised for the whole day with 6 hours, 6 hours and a half of sleep and now I feel like I need naps throughout the day and full 8 hours sleep. I work full time, so no naps for me. I'm almost at the point I reach home and have to go straight to bed.