is presumed to perform different functions in daily activities, especially in
consolidation of memories. Naps (short period of sleep) have proven to benefit
in memories retention. Some neurophysiological components such as sleep
spindles are believed to be important for memory consolidation during sleep.
Naps also boost performance in well-rested people, for instance the reaction
time, logical reasoning, mood management and symbol recognition. Further
researchers should investigate whether the environment conditions will affect
the quality of naps.
Key words: Sleep, Naps, memory retention,
sleep spindle, mood management, symbol recognition
nap is a short period of sleep taken during daytime hours as a supplement to
the usual nocturnal sleep. It can be of planned napping, emergency napping or
habitual napping. Sleep is assumed to be crucial in memory consolidation. Numerous
studies have shown advantages in different memory activities after sleep (Diekelmann
& Born, 2010; Diekelmann, Wilhelm, & Born, 2009). A short nap for a
period of 20-30minutes is recommended to improve alertness and performances.
In the past studies had proved that
people who slept for a night perform better on a visual texture-differentiating
test than people who do immediately after learning it. Mednick et al studies
revealed that people who took 60 to 90 minutes of nap perform equally well with
people who slept full night. (Mednick
and colleagues, Nature Neuroscience, 2003). A daytime nap can bring advantages to a various memory domain.
In one latest study shows the ability to bring back memories in volunteers who
learned single words as well as random word combinations. 50% of the volunteer
nap for 1.5 hours while the other 50% of them stayed awake. Both groups are
then tested, and the result showed that volunteers who napped recalled more
word combinations substantially. This type of “associative memory” is dependent
on hippocampus function which can be enhanced by naps. (Mecklinger ,Neurobiology of Learning and Memory 2015).
According to Mednick, a short nap
works like a dose of caffeine in enhancing learning capabilities. She realized
individuals who took a nap shows better performance on a verbal-word recall
task rather than those who consumed caffeine. (Behavioural Brain Research, 2008).
Performance, emotion and reaction time
increases with the length of napping time. An 8-hour nap is best in sustaining
the three aspects as compared to consuming caffeine. Overall, daytime nap helps in maintaining
higher productivity in the comparison to caffeine which loss its power in 6
hours. (Michael H. Bonnet et al 1995)
According to Gauri Sarda-Joshi, a social psychologist,
short naps improved the feeling of welfare, mood and energy levels in
comparison to those who does not have afternoon nap. They are more energized
and feel less distress after the naps. A study done by University of Michigan
showed that people who took an hour nap are less impetuous and more tolerate to
frustration compared to those who watch nature documentary for an hour. (Personality and Individual Differences,