Interesting question! Made me think for quite some time.

Few examples:

I arrived at six.
Hmm.. sounds right.

I jogged at six.
Nah..that's weird.
I was jogging at six or I went to jog at six. Yup that's right.

So for verbs that refer to a prolonged activity, the past tense should have a period/duration qualifier and not a point in time.

That is why I can say, I slept through the day.
But not I slept at six.

Edit:

I went to sleep at six.

"Sleep" here is more of a noun than a verb, as in the sentence "I went to bed at 6" . It acts a state of being rather than an action. The verb in this sentence is "went".

P.S: I am one of those non-native English speakers who used the same phrase ..till I read this question.

Source: https://www.quora.com/Why-is-it-incorrect-to-say-I-slept-at-six-in-English





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Nice one

It's obvious that we can never fully master English language, and we'll be learners forever. Even in our native languages, we make lots of grammatical blunders without knowing it.

heheheh you will think English is simple until you have had F9 in waec many times,then you find out you don't even know all the rules of concord.

What I know is we don't and can never know the exact time we slept, you can only know when you woke

hernandson:
heheheh you will think English is simple until you have had F9 in waec many times,then you find out you don't even know all the rules of concord.

ituglobal:
It's obvious that we can never fully master English language, and we'll be learners forever. Even in our native languages, we make lots of grammatical blunders without knowing it.

Well, we can make blunders in our native languages without raising eyebrows.....BUT..... just say/type "i is here" and the whole Nairaland would "carry your matter on-top head".....lol....

I ain't perfect and truly, i don't really have to be.....We're yet to even master/perfect our local languages; talk more of a borrowed one.....But that doesn't mean we shouldn't try our best though....

Thanks OP.....Happy Sunday Y'all.....

I go sleep for six

u cn only go to bed at six. bt sleep is lyk a thief.