[getnormality]

> As always with a lot of these: it's not saying causation.

But what they are saying is, it would be valuable if it was causative wiggles eyebrows

Last sentence of the abstract:

> Sleep regularity may be a simple, effective target for improving general health and survival.

[HumblyTossed]

> Sleep regularity may be a simple, effective target for improving general health and survival.

But why would it NOT be? Seems stupid for us to have evolved into beings that need our sleep to be irregular.

[kqr]

Because for it to be effective it must have reasonable cost compared to the benefit. The cost for such a sweeping lifestyle adjustment seems quite high, and the authors have not showed any benefit to interventions.

[raddan]

There are things that are causal and have little to no effect and things that are causal and have a large effect. I think determining whether and how much something matters, especially when the target audience is "all humans" is a worthwhile endeavor. So it may seem obvious to you, but many many important scientific findings were because somebody looked a little deeper at something that seemed obvious to everyone else.