I have found the reason for
@Sentinel's insomnia. As usual, the answers were in evolution. We can conclude the following:
Sentinel has a small brain so he requires less sleep.
Sentinel is afraid of predators - this probably means burglers today.
Sentinel eats food of lower calorific density.
Solutions:
First issue has no solution.
Install alarms and surveillance systems.
Eat more calories, like Chicken Butter Masala and Gulab Jamuns.
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https://www.alaskasleep.com/blog/non-human-animals-and-sleep-is-there-a-connection
While sleep patterns vary widely among animal classes and species, there are a few general rules of thumb. Sleep serves important evolutionary functions for all animals, but sleep patterns and positioning are based in large part on available food supply and defense mechanisms.
Sleep helps animals
consolidate memories and learn, which is why animals with larger brains require more REM sleep.
Sleep patterns in animals have evolved over time – animals that sleep and get attacked by predators are less likely to pass on their genes, so animals have developed ways to protect themselves during sleep. For instance,
otters sleep holding hands, or will wrap themselves in seaweed to protect their young and stay afloat while asleep. Likewise,
cowsand
sheep sleep in a herd – there is safety in numbers.
Evolutionary biologists speculate that predation and fear of predators has influenced the development of sleep patterns across species. Carnivores tend to sleep more than herbivores. Cathemeral species like
lions sleep in short spells during both the day and night so as to enable them to seize food when it becomes available.
In general, animals sleep according to how much they eat – animals that eat food with a lower caloric density sleep less than others. This may explain why herbivores need to spend more time awake, to ensure they get enough food and energy. For example, grazing animals like
giraffes and
elephants sleep 30 minutes to just a few hours per day, respectively. However, there are exceptions to this rule, like the
koala. Their eucalyptus-based diet doesn’t give them much energy, so they sleep for almost 15 hours per day, and split the rest of their time eating and resting.
