Heaven is the kind of place that gives you that feeling of home. It is known as a friendly and happy place, even though, of course, not everyone living there is, indeed, happy.
Angennies can have depression, they can be sad and they can be anxious in Heaven. The luck they have is that they live in an environment that gives them a good quality of life.
Day and night work just like in our world. Angennies work and play during the day, and sleep at night. That's simply the routine they have, with the exception of Heaven being located above some of the clouds. Given that fact, they can't witness rain like we do, but they do have very defined seasons (summer, winter, spring and autumn).