[ He follows closely, opting to hang out by the bathroom door while Ianto gets himself cleaned up. He knows what it's like to be around someone easily spooked and although Ianto isn't blabbering about how the sky is on fire, Spike still lingers with the sort of quiet anticipation he maintained around Dru. You never know what'll trigger something. You have to prepare for anything.
As for sleep, he usually doesn't get any until closer to sunup. Some habits die hard and in this case, maybe that's a good thing. He can keep watch. ]