6 hours of sleep is not bad as long as you feel rested and were not up and down all night. 8 hours would be better but each of us has a different amount of sleep we need to function at full capacity.
Our sleep-wake cycle is regulated by a "circadian clock" in our brain and the body's need to balance both sleep time and wake time. A regular waking time in the morning strengthens the circadian function and can help with sleep onset at night. That is also why it is important to keep a regular bedtime and wake-time, even on the weekends when there is the temptation to sleep-in.
A relaxing, routine activity right before bedtime conducted away from bright lights helps separate your sleep time from activities that can cause excitement, stress or anxiety which can make it more difficult to fall asleep, get sound and deep sleep or remain asleep. Avoid arousing activities before bedtime like working, paying bills, engaging in competitive games or family problem-solving. Some studies suggest that soaking in hot water (such as a hot tub or bath) before retiring to bed can ease the transition into deeper sleep, but it should be done early enough that you are no longer sweating or over-heated. If you are unable to avoid tension and stress, it may be helpful to learn relaxation therapy.
Do check out our resources at the top of this page as there is much great info that you may try to bring down your tension before bedtime and enable you to get a couple of extra hours of sleep.
Good Luck,
Kitt