My girlfriend lies to me about to going to sleep, what to do?

Anonymous
My girlfriend and I would be texting and she would say "I'm falling asleep, I'll sleep now" so she says goodnight and stops replying. However, one time after she did this, I logged onto our Netflix account and noticed she was watching something. The next day I asked her about it and she said she was sleeping, so I let it go that time but I told her that if she needs to do something she can just say "hey I'll do this and go to sleep, goodnight" instead of lying. This time she said the same thing that she's "very tired and can't keep her eyes open" and now I noticed her replying to posts on social media after that. I honestly don't understand why she does that especially when I caught her before and told her that it's fine if she wants to do something else she could just say that. Also my ex girlfriend would say "I'll be on instagram for a while until I fall asleep" and it never bothered me but the lying does bother me. Thoughts?
My girlfriend lies to me about to going to sleep, what to do?
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