Nearly 39 weeks, is this normal?

Over the last 3 or 4 days I have become extremely lethargic. I can't get out of bed in the morning and i am still in my pj's 'til late afternoon and I am just eating rubbish and sitting in front of the tv. I have been on maternity leave for a few weeks already and up until a few days ago the house was immaculate and all meals prepared, now I can't seem to find any energy to do anything and I feel really lazy and useless. Has anyone else felt like this and will it last? Thanks