Yes, his singles are sleepers. It's like going to a Casino and seeing that the Blacks are 66% in front of Reds, so you bet on Red because it needs to catch up. That's even money, but here the Doubles have a slight edge, so they always catch up. To catch the sleepers would need to be at the start of phase 1 or 2 (virtually or actually betting on them), otherwise we would have to wait for the Doubles to be stretched so far above the sleepers by a certain spin number that the sleepers would need to catch up.
Phase one, as described, bets only on the possibility of repeating numbers. Same with phase two (an attempt to convert singles into doubles, and doubles into triple repeats...etc). At no time did the author explain how to convert sleepers into singles except to suggest there was a balanced relationship between landed numbers and some mystical "pair". The only way you can bet on an unlanded number is to bet on an unlanded number, preferably selected by something other than luck. None of his examples showed any bets on unlanded numbers, but its clear thats what you have to do, with the pairs table and perhaps a couple more factors to guide the selection of unhit numbers. Until someone starts betting on unhit numbers ("sleepers")in some intelligent way, not all clues left by the author are being heeded, and we are apt to go astray on dead end tangents, confused by duplicious linguistical syntax (kind of like where Christianity is right now). On the other hand, the puzzle might be unsolvable, in which case the author must have been trying to sell software. Speaking of which, has anybody checked out his DATA extraction spreadsheet/software?