I hope you meant 32 oz. of Gatorade with 8 oz. of Miralax. I just did it 3 weeks ago - seems I started "going" just about time I finished fluid also. I had to mix with Powerade this time as I got so sick with Gatorade but this time I got sick too - all worked out ok. Seems I dozed all night between "going". Good luck!
ElaineNY