In using Viagra to stimulate blood flow and healing, primarily to maintain or recover size and perhaps for future intimacy, I found that the traditional method of taking the medication prior to bedtime only resulted in perhaps one or two "events" and seemed somewhat a waste of the medication, particulary since I have found that errections of any consequence are only occurring when I am in the standing position.
As an experiment, I tried medicating in the early afternoon after my stomach had emptied from lunch. After the medication took effect, visits to the restroom provided multiple opportunities for short sessions of "physical therapy" sufficient to plump things up but not carried to any final conclusions.
This seems as if it would more effectivly satisfy the goals of erectile rehab where blood flow is concerned. In addition, I find that the stuffy nose side effect is more easily managed when I am upright and not trying to sleep.
One downside is that my face flushes with the medication, so I have had to come up with plausible explanations as to why I am blushing.