I read that too, would find it difficult to take a pill every hour the day before due to, well, being asleep for some of it. I've always assumed Humphrey to be more trustworthy than Nitschke, who seems a bit snake-oil on occasion. Really not sure how best to proceed and could really do with further advice in terms of prep as l can't afford to get it wrong.
I've read extensively on this subject now and I feel the most confident with the system used in a Guide to a Humane Self-Chosen Death. I have chosen this for myself based on the authors, and their credentials are the most trustworthy and credible. This is just my opinion of course and every one needs to do their own research. The hard part is trying to choose from all the conflicting suggestions, but I guess it hasn't been researched like most medical fields and it's impossible to cater for each individual anyway...
That book suggests (on Page 27):
'The first choice of anti-emetics is Metoclopramide. Over a period of 36 hours, every 6-8 hours take one tablet of 10 mg. The last tablet should be taken one hour before the planned ingesting of the pills... One can continue to eat normally until 12 hours before taking lethal drugs. It is important to not eat any more (after this time), so that the stomach is empty. This encourages the assimilation of these drugs into the body. One can continue to drink normally and can take a biscuit or cracker 30 minutes before the swallowing of the lethal substances.'
I think this has been the most comprehensive and well researched (with sources included) of the information I've read on all the important topics. I'd recommend reading it, if you haven't already.
Have you decided which method you will use yet and how did you choose?