This might get eddited, because I've been trying to make it flow better (with Ema's help). But here's the latest version.

You were my sunshine,
my only sunshine.
You brought light
into my life.
You'll never know, dear,
how much I miss you.
But I have to spare my sunshine of pain.

One night, dear, while I was sleeping
I dreamt you held me in your arms.
When I awoke, dear, I was mistaken.
I had to cry myself back to sleep.

You were my sunshine,
my only sunshine.
You brought light
into my life.
You'll never know, dear,
how much I miss you.
But I have to spare my sunshine of pain.

Sunshine, my only sunshine
I'll do anything I can for you.
If leaving, dear, will make you happy
I'll walk all the way to Japan.

You were my sunshine,
my only sunshine.
You brought light
into my life.
You'll never know, dear,
how much I miss you.
But I have to spare my sunshine of pain.

I will manage, my only sunshine
to go on, without your love.
If I fall along the way,
please do not look back.
Continue, along your way
and let light shine on your path
If I never get up, dear, it's what I wanted.
So please do not worry about me.

You were my sunshine,
my only sunshine.
You brought light
into my life.
You'll never know, dear,
how much I miss you.
But I have to spare my sunshine of pain.