When I woke up early in the morning, there were 15 of these staring at me.
I closed my eyes for a snooze, and when I opened them, there were still 15.
I arose to get dressed and when I turned back around, there were only 11!
As I ate my lunch, I saw 19 of them watching me in the kitchen.
Throughout the day, the least I ever saw were 6, the most: 21.
At one point I saw 8 of them; I wished I could be doing something other than watch them but there was nothing else to do.
Eventually I got tired of counting and, with 20 of them watching, I fell asleep.
When I woke up the next day, there were none at all! Getting up, I knew what I had to do to bring them back.
What are 'they' in the riddle? What did the author have to do to bring them back? In your answer, be sure to explain the count of them in each line.