asleep in a pool

I was barely awake this morning for my swim. I only got about 5 hrs of sleep or so.. Even though yesterday was my rest day all I want to do is go back to bed. I got to the pool around 6:15a started with 300yrds warm up. Still was half asleep it felt. I did about 500yrds of drills - more than I probably needed but I felt like working on my form. So I did the drills from my swim lesson and single arm drill. I started on my main set doing 100yrds with 15 sec rest between. I never felt like I woke up or got in a rhythm so in an effort not to drown I only did 5 of these then stretched. Even now all i want to do is go back to sleep.