BI think I overslept because of had beenving to dealing with things in my house for the last couple of days.

This sentence can't stand on its own, it needs the first part.

Finally, I can go back to sleepsleep again.

"I can go back to sleep" makes it sound like you are about to go back to sleep, right now. Based on your text, I don't think it's what you mean.

Today was the first day, which is today, I was getting 12 hours of sleep after dealing with these issues, and I slept for 12 hours.

Edited for clarity

6 hours ofI slept for 6 hours during the night sleep,and 6 hours left through outduring the day.

I just woke up at 4pm, and I feel a lot better than before.

Still bogged me down a littleBut I still feel a little bogged down.

You might be feeling "groggy" which is a word we often use to describe for that sleepy, slightly confused or dizzy state we can be in when we first wake up from a nap or long sleep.

At least I didn't forgoet to write on LangCorrect.