How Does a Caffeine Nap Work?
Our desire to sleep is dependent on two processes: homeostatic sleep drive and the circadian alerting signal. Sleep drive refers to the fact that the longer you’re awake, the sleepier you’ll become.
This is due to the accumulation of a chemical in the brain known as adenosine. Adenosine is a normal byproduct of metabolism. Our body cells use adenosine triphosphate as their main source of energy, with the leftover component being adenosine. The longer we stay awake, the more energy we use and the more adenosine accumulates in the brain.
Sleep is, for the most part, a way of clearing away the accumulated adenosine. By morning, after a good night’s sleep, the levels have decreased, and start increasing again with prolonged wakefulness. If you only manage four hours of sleep one night, you will wake up feeling tired still as you have not had sufficient time to clear out the adenosine. It’s important to recognize that even short periods of sleep may reduce adenosine levels. Therefore, a quick nap may reduce sleepiness and increase alertness.
When caffeine is coupled with a nap, these effects are enhanced. Caffeine independently works to block adenosine, the signal for sleepiness. This is how it acts as a stimulant and helps us feel more awake even if we haven’t slept. As a result, a caffeine nap pairs two interventions that are known to reduce tiredness. Research has demonstrated that this combination is more effective than either by itself at improving measures of alertness.
When Should You Take a Caffeine Nap?
You should consider taking a caffeine nap when you feel extra tired during the day. For most of us, this may correspond with a natural dip in the circadian alerting signal that occurs in the afternoon, often between 1 and 3pm. Incidentally, this is why some societies observe siesta time in the early afternoon (which is often the hottest part of the day.
To avoid insomnia, it’s best to avoid taking a caffeine nap later in the day or near bedtime. Caffeine is metabolized by the liver, and about half of it will be eliminated in 5-6 hours, so you might want to avoid it beyond the later afternoon if you’re prone to insomnia.
Other Ways to Avoid Daytime Sleepiness
If you are always sleepy during the day, it’s probably due to inadequate sleep quality or quantity. Sleep deprivation will often occur in adults who get fewer than 7-8 hours of sleep per night. Try to get adequate hours of sleep at night, keeping your sleep schedule regular, and make sure to get 15-30 minutes of morning sunlight upon wakening.
Remember that caffeine is no substitute for sleep. Though it may mask the symptoms of sleepiness, the effects are temporary. Therefore, if you are routinely feeling sleepy during the day, you should go see a doctor to find out how your sleep can be improved.
Source: verywell
Images: depositphotos
