as I had to drink 124 oz of the prep along with laxative tablets and GasX chewable and only water to drink starting the evening before. Like you the whole day before I was only allowed to have clear liquids.

I was able to sleep in my bed with no issues after I spent 5+ hours on the toilet (went more times than I can recall just FYI). Just stay near a toilet for several hours after you start just in case.