I have that same nap drooling problem! Longest I’ve slept was about 20 hours straight, which was preceded by sleeping through all my flights (San Fransisco to Toronto, there to Copenhagen and there to Helsinki) and the drive from LA to San Fransisco. I got horrid food poisoning at Universal, had to get an IV drip after not keeping even water down for over 24 hours and was given some heavy heavy medication so I was out like a light for the following three four days.