Should I text him?

So I’ve been seeing this guy for about two weeks and a half. We text everyday but he hasn’t today. He expressed interest in wanting to ask me to be his girlfriend, but I told him to that I was scared we’d fizzle out so he said that if we still felt the way we do in a week he’d asked me out and I agreed. He works over nights so he sleeps most of the day. The last thing I texted was a goodnight message to which he didn’t respond. He did tell me that he was going to be really busy so that he’d text me when he could. But I never got a goodnight message like I usually do. It’s now 8 which is the time he wakes up to get ready for work but he hasn’t messaged me. Is it okay for me to text him?