Ran 3 miles again

I ran for 3 miles this morning, and I felt fine for the first half and then I started getting tired during the last half. My wakeup heart rate was 58. I only had 6 hours sleep last night. I've been having trouble getting dehydrated due to not drinking enough water, and that has affected my sleep at night and probably my wakeup heart rate. I'm trying to drink more water during the day. I do carry water with me and drink one cup per mile, but when I get home, I get busy and forget to drink.

 

Water, water, my kingdom for a drink of water!