Tapering and Tired

Yesterday was my last workout before my race this weekend. 15 min. bike and 15 min. run. It went fine but I was completely exhausted last night and am just as ridiculously exhausted today. I did some Googling and apparently this is normal during tapering as it is your body's way of recovering from built up fatigue. I only hope I've allowed enough time before the race for my body to sufficiently rest because at the moment I feel like I could go to bed now and sleep through the weekend!