But diagnosed bipolar people know this. This is potentially harmful advice because many people may not know they have a latent bipolar disorder that hasn't manifested yet. In my parent comment I gave a histogram of the age of onset of one's first episode -- it's well possible to be a nondescript software engineer in one's early 40s and literally go crazy.
Of course, your proposal also has merits, so people should weigh risks and benefits. Also note family history, history of depression, etc. which are also risk factors.
Here's a recent survey of what w know about bipolars and sleep https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4935164/
But basically this has been known empirically since old-timey asylums. Hippocrates probably has a hint of this as a factor of the "sacred disease". It's a fact.