Lately, I have a lot of work to do and I don't have enough time to sleep. I'm looking forward to school because I'll be on summer vacation in about a month, but it's hard now! I want to sleep early today!

Lately, I have had a lot of work to do and I don't have/(haven't been able to get enough sleep/I haven't had) enough time to sleep. I'm looking forward to the end of this school year because I'll be on summer vacation in about a month, but it's hard now! I want to sleep early today!

Lately I have a lot of work to do and I don't have enough time to sleep. I'm looking forward to school because I'll be on summer vacation in about a month, but it's hard (difficult) now! I want to sleep late today!