Define hard. A regular work day leaves me noticeably tired, not physically but somehow mentally and it translates to yawning and feeling a bit drowzy. It's lik

Define hard. A regular work day leaves me noticeably tired, not physically but somehow mentally and it translates to yawning and feeling a bit drowzy. It's like being tired in the head, and sans any bodily aches it feels exactly like a hard days physical work.