You were sleeping when you sent the text message.

You can't say that. Maybe it is because your boyfriend is too tired. Sometimes it may be caused by many reasons. If you two are long-distance lovers, please trust each other. If you really like her, If he doesn't care about you, he doesn't even have to reply to your text messages. But it is because he cares about you that he will always send you text messages until he goes to bed. I will continue to send you text messages after I get up in the morning.