Yes they will slow down eating in winter, most of mine have, and my adult male is eating maybe once a week. I would warn against any force feeding.....unless direct and shown how to do so by a vet. It can be more harmful. Oh and make sure that the temps are correct, hope that helps 
Red 
>>HI, Im wondering if leopard geckos slow down this time of year (brumation/hybernation)
>>My friend aquired a gecko a few months back...today she told me her gecko inst eating..this is the fourth day...What should we do for this little one...i think she has been able to get some 'fluids' in
>>
>>
>>Thanks for the time
>>Brad
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Crested Gecko Zeek:1.0
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
Chip: 1.0 papillion (small dog)