Don't use anything that sends blue light to you-- it's well known. Your brain goes "oh shit, suns out, stay alert." This application: https://justgetflux.com/

Don't use anything that sends blue light to you-- it's well known. Your brain goes "oh shit, suns out, stay alert." This application: https://justgetflux.com/ https://justgetflux.com/ Will remove blue from your devices (iOS requires a jailbreak I believe). The application is invaluable for me as it has made a dramatic difference on my ability to quickly get to sleep.