This has been consistently my experience -- if I am awake at night and use a phone, I will almost never get back to sleep; reading (on a book or on a frontlit kindle) means that I'll start to feel sleepy and go back to sleep. This is independent of brightness or color of the screen so far as I can tell.
But then again, it's not a great experiment because there are times I reach for the phone and times I reach for a book, and those may reflect the amount of stress or tiredness I feel at the time; i.e. how much interactivity and restlessness I am desiring or experiencing.
The null results I do not find surprising but I would love to see more research on using phones vs. reading vs. e-ink reading and how that influences sleep patterns.
But then again, it's not a great experiment because there are times I reach for the phone and times I reach for a book, and those may reflect the amount of stress or tiredness I feel at the time; i.e. how much interactivity and restlessness I am desiring or experiencing.
The null results I do not find surprising but I would love to see more research on using phones vs. reading vs. e-ink reading and how that influences sleep patterns.