It's quiet understandable, just a couple of things you need to correct such as fatigue, the appropriate word would be tired or warned out and instead of saying sleep a lot, you could say to rest a bit or to catch my breath if the message you're sending is not formal. Other than that I think it's alright. Good luck with the rest .

Your message makes sense, but here are some minor suggestions to make your writing more grammatical/native sounding. :) Sentence 1: Thank you for telling me your schedule./ Thank you for sharing your schedule with me. Sentence 2: I am afraid that I am totally tired/fatigued/worn out during weekdays due to a busy schedule, so I need to sleep a lot/ need lots of sleep/ need some rest. Sentence 4: Would that be convenient for you? I hope you have a fun time meeting with your friend!

Your message makes sense, but here are some minor suggestions to make your writing more grammatical/native sounding. :) Sentence 1: Thank you for telling me your schedule./ Thank you for sharing your schedule with me. Sentence 2: I am afraid that I am totally tired/fatigued/worn out during weekdays due to a busy schedule, so I need to sleep a lot/ need lots of sleep/ need some rest. Sentence 4: Would that be convenient for you? I hope you have a fun time meeting with your friend!