I put my 6-month-old down for the night a little while ago. She was awake when I put her down, and less than ten minutes later with no crying, she was dead asleep. I try this during the day, and she cries until I go get her. She only naps in a couple 15-30 minute bursts.
Her nursery is unfortunately pretty bright during the day even with blinds closed (due to huge windows and a skylight). It's also warmer upstairs during the day.
My main question is: why such a stark difference, and what can I do to make napping more like nighttime sleeping?