Expression "to indulge in"

[Cristina O.]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #72 "At the End of the Day (1)", question 10

Of course as you grow older, you ......... in the luxury of short sleeps during the day.

(a) enter
(b) fall
(c) indulge
(d) incur

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #72 "At the End of the Day (1)", answer 10

Of course as you grow older, you indulge in the luxury of short sleeps during the day.

Correct answer: (c) indulge
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Hello,

I can't understand this expression, to indulge in.. I found also to indulge in a little nostalgia
Thanks,
Cristina

[Mister Micawber]

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To indulge in = 'to allow (oneself) to follow one's will (usually fol. by in): to indulge oneself in reckless spending.'
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Native English teacher at Mister Micawber's