David Attenborough writes:
“This time of year bees can often look like they are dying or dead, however, they’re far from it. Bees can become tired and they simply don’t have enough energy to return to the hive, which can often result in being swept away.
“If you find a tired bee in your home, a simple solution of sugar and water will help revive an exhausted bee.“
http://www.storiesofthemoment.com/why-you-should-always-put-a-spoon-of-sugar-in-your-backyard-before-leaving-home