How do you respond to late night text messsages?

I got a message from the guy that lives next door the other night around 10:30 asking me what I was up to. He had asked me to hang out with him the other week, and I told him no so I ignored this message. Was it inappropriate of him to send me a message at that time of night or am I over thinking it?
How do you respond to late night text messsages?
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