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雷达卡
I went through the answers and I am utterly disappointed with two things-
1) The answer focus more on providing solution (cheeky answers written for upvotes) rather than understanding the nature of the question
2) Not showing empathy towards the asker (asker seems more keen on knowing why he has underwent such a change and is curious about this unexplained phenomenon)
Before I answer the question I want to assure the asker that this is perfectly normal and that right now that makes two of us.
And now the answer-
The difference between the phenomenon that asker is suffering from and that I am yet experiencing (I don't consider this this as suffering and I am perfectly ok with late to bed and late to rise concept) is that asker has experienced the change two years ago while I have had such kind of 'patches' throughout my life. Having access to genetics and animal development (my favorite subjects during graduation) and my casual interest in neuroscience helped me to understand this problem to a little deeper extent. Its was not a 'research project - like' approach but a thirst to quench my burning curiosity. And so one day, I finally stumbled upon this thing called the Biological Clock .
Our body responds to the cycles of nature. We all know that seasonal changes affect the surrounding. It affects the crops, birds, animals, insect and even us humans. But do you know that there is another cycle that affect us daily and embeds a pattern in our body? It is the Circadian cycle or simply the day and night cycle, the real culprit behind the whole problem. The Circadian clock in our body responds to this cycle and brings about changes in our body those affect our daily habits. Circadian clock is a biological clock. A biological clock is defined as-
An innate mechanism that controls the physiological activities of an organism which change on a daily, seasonal, yearly, or other regular cycle.
Circadian clock is a biological clock that drives the circadian rhythms in our body. Circadian rhythms are oscillations of biological activity based on a 24-hour period and influenced by regular variations in the environment, such as the alternation of night and day.
Sleep is regulated by two body systems: sleep/wake homeostasis and the circadian biological clock. Sleep/wake homeostasis tells us that a need for sleep is accumulating and that it is time to sleep. Circadian biological clocks regulate the timing of periods of sleepiness and wakefulness throughout the day.
(Full article: Sleep Drive and Your Body Clock)
Did You Know? Why do you sometimes wake up on time even if your alarm clock doesn't ring? How do nocturnal animals know when it is time to wake up? It's because you—and most other animals—have a kind of internal clock that controls the cycle of the day's biological activities, such as sleeping and waking. These daily biological activities are known as circadian rhythms because they are influenced by the regular intervals of light and dark in each 24-hour day. While the process underlying circadian rhythm is not completely understood, it is mainly controlled by the release of hormones. The brain regulates the amount of hormone released in response to the information it gets from light-sensitive cells in the eye, called photoreceptors. Circadian rhythms can be disrupted by changes in this daily schedule. For example, biologists have observed that birds exposed to artificial light for a long time sometimes build nests in the fall instead of the spring. In humans who travel long distances by air, the local time of day no longer matches the body's internal clock, causing a condition known as jet lag.
Source- http://www.thefreedictionary.com...
So, it is the disturbance in our circadian biological clocks that causes weird sleeping patterns. Although, usually the disturbances occur due to change of habits, they may also be inborn either - inherited or result of genetic mutations/recombination.
Here are some interesting research articles:
Gene Mutation Upsets Mammalian Biological Clock
Scientists discover a protein that silences the biological clock
Natural selection against a circadian clock gene mutation in mice
So, one may find that his response to circadian cycle of nature is very different than from others. While others feel active at day, he/she may feel more active at night. And this may have nothing to do with your habits and discipline.
NOTE (update): The question seems to have changed after I started writing answer. The answer is written w.r.t. original question and makes more sense that way.
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