One of the most common complaints I hear from seniors at my practice concerns daytime sleepiness.

But too many of them accept it as normal. Some of my patients won't even mention it to me unless I ask first. They're convinced that it just comes with the territory – that as you get older, you simply get run down more easily during the day.

Nothing could be further from the truth, and a new study bears that out.

The study, published online in the May Journal of the American Geriatrics Society, tracked 11 older adults (ages 65-76) and 26 younger adults (ages 18-29). For three days, they slept a standard 8 hours per night. Then, they were kept awake for 26 hours as researchers tracked their abilities and attention spans.

They weren't allowed any caffeine during this period – just their own natural abilities and stamina.

And wouldn't you know it – the seniors were less impaired by the lack of sleep. They had faster reaction times, fewer performance lapses and paid better attention.

You know that old stereotype where the senior starts nodding off in the middle of doing something? Throw that one out the window. It turns out the younger adults were more likely to accidentally nod off.

What this really means is that if you're getting a normal night's sleep, you shouldn't be tired during the day – whether you're a vibrant senior or a young whippersnapper.

If you find yourself getting tired in the middle of the day, it's time to stop accepting it as part of aging and get to the cause. In some cases, you may be suffering from a sleep disorder. For other folks, it's a side effect of one or more prescription drugs.

But in many cases, I've found their fatigue problem to be a potassium deficiency.

In the June issue of Health Revelations, I'll be taking an in-depth look at how a lack of potassium can be wearing you out – and I'll show you how to diagnose and fix it, on your own, without pricey and dangerous prescription meds or repeated trips to a doctor's office. Sign up to read about it today.

Then, when you return to your normal, natural wakeful state, you'll see you can run circles around those kids half your age.