7.5 hrs....soundly, after taking 1000mg magnesium! Keeping my curtains open so the sun shines on me in the morning, setting the alarm for the same wake up time-sunrise, getting up and looking at the beauty outside, and mostly avoiding all negativity-includes all sensory input (music, videos, TV, and phone calls that could be other people gearing up at night with their shit, and no negative output on my part like....journaling, poetry, personal conversations) past about 5pm has helped tremendously to keep my head noise quiet and promote keeping my circadian rhythms in sync during the cloudy or sunless days of winter!