Best riddles with simple answers

I live in a hotel, on the land or in the sea, whatever could I be?

What has three letters and starts with gas?

What goes on increasing every second but never decreases?

What does a man have that no other men has?

I am covered in feathers or foam, yet I have no wings and cannot fly. I am the only place where you can lose and find your mind at the same time.

I am a large cat, but I don't meow. I have a loud roar that can be heard from miles away. Who am I?

Bob's father has four children: Momo, Meme, and Mumu. Who is the fourth child?

They fight against me day and night, They try in vain with all their might. But when I win the final strain, I close their eyes and end the pain.

I come in many colors and I'm often in a wrap. I am a dentist's trap. Children love to eat me, but they shouldn't have too many. What am I?

I have a headboard but no brain, and a footboard but no toes. You visit me to travel to worlds that don't exist. What am I?