Silent laptop modification-how slow cpu fan

[ex.treme]

I'm owner Acer 7750G laptop and wanted slowing down rpm fan cooler.
Because sometimes i sleep beside my laptop i need silent machine.
Changing fan noise and rpm makes me sick when i trying comfortable sleep.

Is there any solution how slowing down or turn off cpu fan?
I thinking about rpm regulator for manually changing rpm - something like desktop has.

[Syndrome]

Have you thoroughly cleaned the vents and fan of the laptop? Most fans are regulated by temperature, the less dirt in there the easier it is for the temperature to drop, thus the less the fan will spin.

[ex.treme]

Thank you for asking. I did repasting before 2 weeks. Results are almost similar except high temps. Fan in type (read review) i have still running or most of the time. Sometimes slow, sometimes faster even if idle. I hate this noise.

Look at picture added. Guess that Acer fan management much aggressive for cpu temperatures. After reaching temperatures over 50°C, fan starting, after reaching idle temperature 45°C fan tuns off. But mostly of time fan running even if temperature reach 50°C on one second.