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Ever wonder why some women seem to have boundless energy and positively glow 24-7, while you find yourself constantly fighting off fatigue? Although you may be tempted to write the difference off to your lack of go-getter DNA, Cosmo knows better. Often, it’s the subtle differences in daily routines that separate the supervital from the always-tired. Here, four questions that will uncover your personal energy sappers—and the simple ways you can get back on the high-energy track.

Do you steal extra sleep on Saturdays?
If you bounce out of bed every weekday morning at seven but snooze until eleven on weekends, you could be setting yourself up for jet lag-like lethargy all week, especially if you tend to wake up then go back to sleep during your weekend snooze-athons. “Your body clock relies on an enormous number of internal and external cues,” explains Richard K. Bogan, M.D., president of Sleep Disorder Centers of America. “If you wake up later than normal, your natural sleeping and waking signals can become crossed.” The result? You’ll feel frazzled and exhausted all week.

That’s what happened to Kathy, a 27-year old marketing manager, “On the weekends, I was sleeping until noon to make up for lost hours during the week. One Saturday, I had to put in some extra hours at the office, so I got up around eight instead, which is a lot closer to my typical weekday wake-up time of six. Much to my surprise, I felt great all day and even noticed that I had more energy during the next week. Now I keep my sleep schedule more consistent.”

Another spunk sabotager? Snooze button abuse. “People who hit the snooze button over and over again sleep fitfully between buzzes, and the extra sleep is so disjointed that they typically wake up in a mental fog that can last for hours,” notes Dr. Bogan. Your best bet? Set the alarm for a realistic time and heed its call (and don’t use the radio as a buzzer substitute or you may be lulled back to sleep).

Do you feel tired and achy at the end of the day?
You’re probably not getting enough of the right kind of exercise. According to studies, increasing flexibility and strength helps improve posture and thus helps prevent end-of-the-day muscle fatigue. Try working some yoga moves into your workout: Its twists and turns help stretch and soothe tired muscles, increase circulation, and aid digestion, all of which have an uplifting, energizing effect. “The deep, focused breathing that’s a big part of yoga also increases oxygen intake, so you’ll notice an almost instant pick-me-up,” explains Alice Christensen, head of the American Yoga Association and author of 20-Minute Yoga Workouts (Fawcett Books, 1995). What’s even better is that yoga requires no fancy equipment and there are tons of good beginner tapes to guide you through some basic combinations.

Tina, a 22-year old computer analyst, started in her own living room. “I was tired and cranky and had just begged off a gym date. While flipping TV channels, I landed on a yoga program. Out of curiosity, I stood up and tried it and was totally hooked. I felt instantly better.” Now she perks up with yoga poses as often as possible. “If I stop doing it for a week or two, the dip in my energy level and overall sense of well-being is instantly noticeable.”

Is your pee bright yellow?
If your urine is canary-colored, it means one of two things: Either you’ve been taking vitamins (which can color your pee) or you are dehydrated. When you don’t drink enough fluid, bacteria and waste products build up in your bladder and show up in your urine. And being even slightly dehydrated can make you feel slow and sluggish, according to Susan M. Kleiner, Ph.D., a registered dietitian and owner and director of High Performance Nutrition in Mercer Island, Washington, who recently warned against the dangers of dehydration in an article published in the Journal of the American Dietetic Association. Kleiner has also studied the effects of dehydration on skin texture and tone. “Water helps dilute and flush out toxins (like alcohol and tobacco) that can contribute to dull, lifeless skin,” she explains.

What’s the best way to meet your daily H2O need? Try stashing a big bottle or oversize cup on your desk (and aim for roughly the equivalent of eight 8-ounce glasses a day). Tracy, a 27-year old social worker, uses this trick: “I have my conventional cup for coffee and my monster mug for ice water. I fill up both every morning, and when my coffee’s gone, I automatically start sipping the water.” And keep in mind that the dehydrating effects of caffeine and alcohol can cancel out a day spend sipping, so be sure to sneak in some extra clear and cool stuff if you’re going to be partaking of either.

Do you carbo-load like crazy?
A bagel for breakfast. Pasta for lunch. All-day nibbling on crackers and popcorn. When the low-fat fad hit a few years ago, virtually fat-free carbs seemed like the answer to our dietary prayers. But any time you concentrate too heavily on one food group, you could be missing out on a variety of vitamins and minerals that play a major role in your daily energy levels.

Alison, a 29-year old graphic designer, found out that breaking out of a constant carb rut made her look and feel better within weeks. “I had such a fat fear that I instinctively grabbed foods I knew were fat-free and more often than not, that meant carbs. But when my gyno recommended that I get more calcium to relieve my terrible PMS, I started to incorporate some different foods into my diet. Not only did I feel more energetic, I actually lost a few pounds! (Carbs may be low in fat but they’re loaded with calories.) Soon I became a little more adventurous, even having things like cheese, something I used to consider strictly off-limits.”

Alison’s energy rebound makes sense, says expert. “A diverse diet guarantees that you’ll get enough of the vitamins and minerals that are crucial to maintaining good health,” explains Kathleen Zelman, a registered dietician and spokeswoman for the American Dietetic Association. A diet consisting mostly of carbohydrates, she says, tend to lack important energy-enhancing minerals such as potassium and magnesium—which help keep the neurons that send movement signals to the muscles in good working order (because bananas, yogurt, and orange juice are all great sources)—as well as B vitamins, which are thought to play a big role in fighting stress, a known energy zapper (foods such as bananas, tuna, chicken breasts, and oranges are also good sources of Bs).