Hi Slommyhouse: Looking at your phone is generally not recommended when going to bed. The light that comes out of the phone screen can suppress melatonin production inside our body, thus making it hard for us to fall asleep.

Hi, /u/Slommyhouse! Adding to /u/MedPedsChief, the impact is different for everyone and additionally varies by duration, intensity, and frequency of exposure. For example, someone engaged in more stimulating content on their phone in the evening may have more difficulty than someone who only checks their email at noon to look for BestBuy coupons.