I'm serious. There's no way he could sleep when Bruce et al are on patrol because who knows when he'll have to come to the rescue or do some mending - not to mention, just normal worrying. I suspect he *could* sleep when Bruce sleeps, *if* Bruce sleeps, but this is the man who brought Bruce up - and you know Bruce had nightmares and has nightmares, and Alfred would be the one who'd go to him. Just like he'd have gone to Dick, because I don't think Bruce would realize that that was his job.
So, he'd sleep lightly, if at all, when Bruce slept. And then he'd be on duty when Bruce was playing billionaire, knowing he'd have to be on call even then.
So, I ask again. When does Alfred sleep?