Does too much phone use make you feel groggy?

[IHateFlies]

I'm feeling very lethargic and groggy and thought it might be my increase in phone use.
I know the heat isn't helping but I think this is exacerbated by a lot of time on my phone.
Out of interest, does anyone else feel this?

Yes, I understand this completely. The days where I use my phone a lot more, I can see a change in my mood - it becomes vicious as I try to put it down but can't, then other days I can go hours without being interested in my phone? Hope that makes sense.