There's one single piece of advice that's universal amongst all sleep experts and researchers. It's to have a consistent bedtime and rising time. This can seem impossible in a culture where we essentially have control over the sun (our indoor lighting).
Why does that matter?
I'll share a few examples and you'll hopefully have a good laugh at how annoying for the human body it is to change up the schedule too often. (think daylight savings time times 3-trillion)