General: October made me do it!

spur-of-the-moment

done suddenly without planning (спонтанний)

on a whim

because you suddenly wanted to do something, without planning it (за примхою / спонтанно)

impulse

a sudden strong desire to do something (імпульс / раптове бажання)

temptation

something that makes you want to do something you might normally avoid (спокуса)

give in to

to stop resisting something and finally do it (піддатися чомусь)

indulge in

to allow yourself to enjoy something that you usually limit (побалувати себе чимось)

embrace

to accept an idea, change, or experience enthusiastically (прийняти / охоче прийняти)

urge

a strong desire to do something (сильне бажання / порив)

seasonal obsession

an unusually strong interest in something associated with a particular season (сезонна одержимість / захоплення)

make an exception

to allow something that is not normally allowed (зробити виняток)

blame it on

to say that something or someone is responsible for what happened (списати щось на когось / щось)

go overboard

to do or have much more of something than is reasonable (переборщити)

fall into the habit of

to gradually start doing something regularly, often without intending to (звикнути щось робити)