Setting DB to Simple Recovery then back to Full Recovery
Merely setting the recovery back to FULL is not enough - you'd need to take at least a differential after setting back to FULL to bridge the gap between the time you changed to SIMPLE and the time you changed back to FULL - then your T-logs should be ok at 6am

Keep in mind that you will not be able to restore to a point in time after the change to SIMPLE and before the differential is taken.

Also, you say that you are taking T-log backups at the top of every hour.  So, you are basically saying that it's ok to lose up to 1 hour of data should a disaster occur.  Does this actually adhere to your company Recovery Point Objective (RPO)?  Please take a look at The 9 Letters That Get DBAs Fired.

And then take a look at Back Up Transaction Logs Every Minute. Yes, Really