I don't really think it would do any good to be honest. People who come in very late after a heavy night's drinking tend not to realise how loud they are being. At best they're unlikely to take any notice and at worst they might think, 'well it's our flat too, we'll make as much noise as we want'.
It's unlikely to achieve anything I think, and you run the risk of souring relations with them. You're probably best tackling the subject when they're sober. Could you point out that you are quiet on a morning when they've had a heavy night so you don't disturb their lie in, so maybe they could be a bit more considerate to you when they come in after a night out?
Is there a room in the flat which might be quieter and, if so, would the owner swap with you do you think? If you're a first year student and in uni accommodation, is there anyone in charge of student welfare you could talk to to see if there is any chance of alternative accommodation?
I really do sympathise with you. I hate other people imposing their noise on me with a passion! My son's girlfriend is in her first year at uni and she is in a similar position to you. Apparently her room is next to the kitchen where everyone gathers when they come in after a night out.
I've always found wax earplugs from Boots more effective at blocking out sound than the silicone ones.
And, if there's no possibility of a room/flat swap to improve things, just keep telling yourself it's only for a few months. Presumably you can sort out something different for next year?