Questions about example sentences with, and the definition and usage of "Sleepless"

A: Without any sleep or in other words that you didnt sleep enough

A: a night that you stayed up. you didn't sleep at all

A: It means you have trouble sleeping, or you did not sleep at all

A: When "less" is added to the end of a word, it means without or to not have.
Sleepless means without sleep/to not have sleep.

Example - I had a sleepless night so I feel tired today.

A: I️ had a sleepless night.
The word ‘restless’ could also work in this sentence.

A: I’ve had many sleepless nights lately

A: Both work but "I had a sleepless night" sounds more natural

A: i rarely had sleepless nights. but, as soon as my children were born, that all changed. they would wake up frequently in the night, and i’d have to get up and give them some milk.

A: ​‎ "Restless and sleepless nights pass in the room filled with darkness. I'm crying out loud, relentlessly staring at the ceiling, and my head keeps buzzing around with questions (that perplex/torment me): why did I step in this world? What's the purpose of my life? Where can I find my inner peace? And where am I heading? On the other hand, anxiety and depression are trying to haunt my mind and take (steal) my spirit out of the body. Despite having all these issues in my life, one unconditional love keeps protecting me from this negativity, and I always want to be thankful for that and live the rest of my life for it. I wouldn't have made this far if it had not been for that love. When I cry thinking how much I miss them, every single drop of the tears that comes from my eyes makes me love them even stronger. The person will never know, nor do I want them to know, how much I love him/her unconditionally. Even though I'm far away from him/her, my unconditional love for him/her always lives deep within my soul."

—You have talked about “the person”, which is singular; so you should continue the thought with a SINGULAR pronoun, him or her. If you use “them”, that is plural.
I have made a few other suggestions. If you have questions, please ask.

A: "I lay sleepless until dawn yesterday.
recently,I have had a few sleepless nights , so i am a little tired"

--You [laid] sleepless because this happened yesterday. You could also use I [was] sleepless.

--[awake] instead of the first [sleepless] since you use the same word again later. It's better to not use the same descriptive word twice in sentences so close together.

"I laid/was awake until dawn yesterday.
Recently, I have had a few sleepless nights, so I am a little tired."

--[Lately] instead of [Recently] and rearrange to place it after [nights]

--Add [of these] to have a better connection between the two sentences.

eg.
I laid/was awake until dawn yesterday. I've had a few of these sleepless nights lately, so I'm a little tired.

--You could also flip the sentences around so that sleepless nights come first and then provide your most recent example. Either works.

eg.
I've had a few sleepless nights lately, so I'm a little tired. I laid/was awake until dawn yesterday.

A: Check the question to view the answer

A: "It was a sleepless night" is used in novels and is a third person view of a story.
"I had a sleepless night" would be more of a natural comment