Why am I so tired?

St

My SO has been sick for almost a week so I have had our son 24/7 for the whole duration. We co sleep and usually we take turns I take a shift and then he does but he slept on the couch for the past week. Now that he feels better he thought he would do me a favor and take our son for the whole night in another room. He brought him back in a couple times to breastfeed and I got a solid 8-9 hours instead of my usual 4-5 hours. But problem is I'm dead now! I just had coffee but I'm still exhausted!! Happy I got some time by myself but dang I almost regret sleeping so much!😂