Vipassana and sleep quality disturbance I tried vipassana meditation and where i used to follow my belly for the inhale exhale. Every time I practised, I found that my sleep quality was disturbed. 
I found myself tired next day after the disturbed sleep. Did anyone experience the same?
What happens when you observe the lying position (not focused but more in a relaxed way, as Lanka describes) instead of rising/falling?
Addition:
I thought about it a bit.
What came to mind is that due to vipassana your awareness increases. Which means that it's possible that you can become more aware of all sorts of conditions. For instance: temperature. What I find myself is that when I'm more aware of let's say temperature I can't sleep like when I'm not. My sleep is more disturbed too due to this (as an example).
But sleep is not always disturbed when practising vipassana before sleep. It depends also on the meditation object. You could try to switch to a different object.
Also, you could do metta instead of vipassana right before sleep.
It supposedly brings better sleep.

Eleven benefits to practicing Metta (loving kindness meditation:

You will sleep easily
You will wake easily
You will have pleasant dreams
People will love you
Devas (gods or angels) and animals will love you
Devas will protect you
External dangers, such as poisons, weapons, and fire, will not harm you
Your face will be radiant
Your mind will be serene
You will die unconfused
You will be re-born in happy realms


https://dhammawiki.com/index.php?title=11_benefits_to_practicing_Metta
http://www.vipassana.com/meditation/facets_of_metta.php