What do you choose to tackle in your deep work sessions?

I meditate while working. It keeps me focused and on track. I also set a time to do work, so that I know no one else has anything going on.

My actual work (vs emails, follow-up, meetings, etc.). Example: write up a document, write some code, read documentation, …

On my job I start with a referral which is the main purpose of my job. I usually do deep work for one hour. I'm thinking of using a 15 min variation of deep work to clean my room in the morning.