Simply: Too much caffeine intake from coffee, tea, energy drinks, and sodas are the most common sleep disturbances. By limiting the intake the problem would improve in no time.
Alcohol is a major chemical that interacts with sleep cycles. At times, prescription drugs may cause sleep disturbance: antidepressants, stimulants are most common medications. They need to be moved to earlier times.
Heavy meals closer to the sleep time also disturbs/interrupts sleep.
Sleep is sensitive to daily stressors. During the idle time at night, thoughts may keep coming back and cause disturbance. First, all factors mentioned above (coffee, medications, alcohol) should be avoided. Then, sleep hygiene should be followed which require no blinking lights, no TV or music, no noise, animals, or snoring partners allowed in the room. Light exercise and light snacks prior to sleep are recommended.
Some over-the-counter medications are available as "sleep starters"
Some sleep disturbances are related to mental conditions. Excessive thinking, racing thoughts, no need for any sleep, or excessive energy all night could be a sign of a major mental condition such as Bipolar Disorder, and requires an assessment by a MH provider.
Hope it helps, and you feel better soon!