我始终没能习惯这么晚上床睡觉的翻译是：I've never been able to get used to sleeping in the bed.
我始终没能习惯这么晚上床睡觉。
翻译为英文是：
I've never been able to get used to going to bed so late.
注：习惯，get used to; 上床睡觉，go to bed
