A. If  you're having trouble sleeping or experiencing an upset stomach (acidity,  indigestion), headaches, shakiness or palpitations (coffee 'jitters'), then  excess caffeine could well be the reason.

Christmas is a time traditionally given to overindulgence as Christmas drinks, office parties, end-of-year farewells and family get-togethers fill our December calendar. It's a time to connect with family and friends and there's food in abundance whether it's finger foods, buffets or those deadly Christmas food gifts like chocolate Santa's and Rocky Road.

Hit a post-lunch slump every afternoon? Feel exhausted at the end of the day? Too tired to do a workout at the gym? Fatigue and lack of energy are real problems for many people today. Lack of sleep, long working hours, juggling to fit in the demands of work and family plus the competition for leisure time take their toll.

Find it hard to concentrate around 4 pm? Feel sluggish with no energy and have trouble thinking clearly? Reach for a chocolate bar to get you through that sleepy period mid-afternoon?

Do you work long hours at a desk or in front of a computer? You can't work for hours and be at your peak without a little help.  Try one or two of my 10 suggestions over the day and you'll see a lift in your energy and productivity levels. I use them to stay on top of things, honestly!

Having trouble drifting off at night? Are you lying awake in bed watching the digital clock tick over or madly trying to count sheep? Or do you fall asleep only to be wide-eyed at 3am? Here Catherine Saxelby offers nine ways to help you get the energising health benefits from a good night's sleep.