A study published in the journal Chronobiology International has suggested that a cup of coffee and a short nap afterward, which they call caffeine-nap, can help individuals working night jobs to stay alert on their jobs. The researchers said that this unlikely pairing can reduce sleep inertia and improve attention.
Stephanie Centofanti, the study author said in a statement, "As a result, they commonly use a range of strategies to try to boost their alertness while on the nightshift, and these can include taking power naps and drinking coffee."
Counteracting Sleep Inertia
Shift workers are often chronically sleep-deprived because they have disrupted and irregular sleep patterns. The findings of the study suggest the combination could help counteract the kind of sleep inertia that is experienced by many shift workers.
According to the researchers, many workers nap during a night shift because they get so tired. But the downside is that they can experience 'sleep inertia' and this can impair their performance and mood for up to an hour after their nap.
"Caffeine is also used by many people to stay awake and alert. But again, if you have too much coffee it can harm your overall sleep and health," Centofanti said. If you use it to perk you up after a nap, it can take a good 20-30 minutes to kick in, so there's a significant time delay before you feel the desired effect.
Miracle of 'Caffeine-Nap'
A 'caffeine-nap' (or 'caff-nap') could be a viable alternative - by drinking a coffee before taking a nap, shift workers can gain the benefits of a 20-30-minute nap then the perk of the caffeine when they wake. The small pilot study tested the impact of 200 mg of caffeine (equivalent to 1-2 regular cups of coffee) consumed by participants just before a 3.30 am 30-minute nap, comparing results with a group that took a placebo.
Participants taking a 'caffeine-nap' showed marked improvements in both performance and alertness, indicating the potential of a 'caffeine-nap' to counteract sleep grogginess. The researchers noted that this shows a promising fatigue countermeasure for shift workers. Centofanti said that the next move is to test the new finding on more people.
(With inputs from agencies)