Major changes in your sleep cycle can certainly wreak havoc on you. This is what jet lag is. Ask anyone who's flown to Europe or Asia. Or Hawaii. Or even coast-to-coast. But when we change the clocks twice a year we're only talking about one hour. Just one hour. "Oh, MAB," I can hear you saying, "That's still a time change! It messed me up!" Yeah? Okay, here's a question for you. What time do you get up to go to work on a normal weekday? For some, it's 6:00. For some it's 7:00.
Okay, now what time do you get up on a normal weekend day? I guarantee you it isn't 6 or 7 for the vast majority. It's probably closer to 9 or 10. ("It's Saturday! I get to sleep in!") So, unless you go to bed and wake up at exactly the same time every day, you are screwing with your sleep cycle far more drastically than this measly hour that switches but twice a year. And you're doing it every week.
That messed-up feeling you're having is entirely in your head. It's fed, of course, by perceived wisdom and even our media. I've seen "reports" on local and even national news warning people to be careful when driving after time changes. 'Cause you're so messed up. You'll definitely be groggy. So thanks for feeding the nonsense, American media.
So you didn't "lose an hour of sleep" last night. You probably slept as much as you would have anyway. This is why they do this on a weekend, when you mess with your internal clock all the time anyway. You lost an hour of watching TV, or reading cranky blog posts.
I have nothing to say on the merits of Daylight Savings Time. I don't care one way or the other what time we all agree it is. We can argue over whether it's better to have it lighter in the morning or in the evening. Go to it. But the discussion and accompanying grief about "gaining" or "losing" sleep is just plain silly.
It's just an hour, people. Get over it.