No need to do it 7 days a week. You wake up at 4 few days a week and sleep longer when u had drinks a day before. Maybe my social life really sucks but I don't really have more lets go for a drink invites than once a week.
Personally, changing my sleep schedule day to day almost never works. I usually end up going to bed and waking up about the same time regardless. Once I start waking up at 4am, I will always end up waking up at 4am.