Is is necessary to do the flush at NIGHT?

Hi all,
I'm quite sure that I will be extremely nauseated (I'm the nausea queen ;) from this procedure the 1st few times and coping with nausea is easier for me during the day when I can distract myself while lying in the appropriate positions. Trying to sleep while feeling overwhelming nausea is a surefire route to actual vomiting for me and I'd rather not lose a whole nights sleep if it's not absolutely necessary. Anyone had any experience with this?
Thanks!!!!!
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