A foggy mind, headaches, grumpiness - all are common symptoms of a bad night of rest.
There is a direct link between how you spent your night and how you feel in the morning.
Which makes knowing how to fall asleep fast all the more important.
If you lie in bed with thoughts racing through your head as the hours tick away you are almost sure to wake up in a bad mood.
So what can you do about it? The brain is a highly complicated system; there can be any number of reasons why you can't drop off.
Stress is a massive contributor, but our modern lifestyles make it near impossible to avoid so you need to find a way to work around this issue.
What you can do immediately is get your environment as productive for sleep as possible.
Get rid of the TV from the bedroom, don't use stimulants like tea, coffee alcohol or cigarettes close to bed time, use thick curtains or blinds to make the room as dark as possible.
These will all help to contribute.
Sometime though nothing you can do will be enough.
When you find yourself in that situation it may be time to turn to technological solutions to this very modern problem.
Many experts recommend relaxing music to help your brain wind down.
Music from earliest times has been used to wind down of an evening and get us ready for bed.
Think of the lullabies you might sing to your children or those that were sung to you.
Science has moved beyond these simplistic but still effective tunes.
There is an alternative to the radio or your favorite band.
It is a specially designed set of tracks called binaural beats.
These have no lyrics of melody for your brain to focus on, instead they use rhythm to target the relaxation zones in your mind.
Most people will find the sounds a bit weird at first; they are quite different to any music we're used to listening too.
But the more you listen the more relaxing it becomes until you won't be able to resist the lure of a good night's rest.
Now you know how to fall asleep fast.