Kindly Correct My Sentences

[MyEfforts]

Hi,

Please check my sentences and make them sound natural as native speaker is speaking them :-

Note: Kindly note all below sentences is not from any text book, these are those sentences which struck to my mind while talking to someone and I have no clue and also no one is here to tell me which one is correct, so no option is left to me except asking from you. Hope I get my answers.

1. Yesterday was really very good and the whole day was spent in a good manner. I completed most of the important work from my backlog and at night I slept with relax. ( - You can change the sentence as if you're speaking it)

2. Generally we ask the caller :- Where are you calling from?
in the same regard I would like to ask which one of the following is correct :-

2a. From where did you get my number?
2b. Where did you get my number from?

3. With night we use at :- We shouldn't work at night.
in the same regard I would like to ask in below sentence what should we use in or at :-

3a. I work in/at a night shift.
3b. I will not be available in/at Elkhart.

Thanks in advance for answering.

[Mister Micawber]

1. Yesterday was really very good and the whole day was spent productively. I completed most of the important work from my backlog and at night I slept well.

2c. Where did you get my number?

3a. I work the night shift.
3b. I will not be available in/at Elkhart.-- What is 'Elkhart'?
_________________
Native English teacher at Mister Micawber's