As I have gotten older, it has become harder to sleep longer hours.
「年をとるにつれて長い時間寝られなくなった」
- As I have gotten older, it has become harder to sleep longer hours.
- With age, it becomes harder to sleep for a long period of time.
- It has become difficult to sleep for a long period of time as I have gotten older.
昔は夕方まで寝ていられたのに、40すぎたら朝に1度目が覚めてしまう
- I used to be able to sleep until the evening, but after I turned 40 I wake up first thing in the morning.
- I used to be able to sleep until the evening, but after I turned 40 I wake up at least once in the morning.
As I age, I don't seem to be able to sleep as long as I used to.
I don't sleep as long now that I'm getting older.
この場合、次のような言い方ができますよ。
ーAs I age, I don't seem to be able to sleep as long as I used to.
「年をとるにつれ、昔のように長く寝られなくなった」
as I age で「年をとるにつれ」
don't seem to be able to sleep で「寝れないようだ」
ーI don't sleep as long now that I'm getting older.
「年を取ってきて長く寝れない」
now that で「〜してみると・今や…だから」
ご参考まで！
アメリカ合衆国 
カナダ 
