Al Safwa has been increasingly busy and getting a room to grab some sleep has been harder and harder of late - my approach for longer layovers has become booking one of the discounted hotels through Discover Qatar and just leaving the airport. Without a room to catch some shut eye there is no point staying in the lounge for that long. Leaving/coming back into the airport through the priority exit/entry is extremely efficient
That is - provided you don't have visa issues of course.