Falling headlong on the couch is said in English

He threw himself down on the bench and fell asleep.

He fell asleep on the bench.

The old man throw himself down on the bench and fall asleep.

The old man fell asleep on the bench.

He beat his head against a post.

He hit his head against the pillar.

The boy butted into the wall.

The boy slammed his head against the wall.

Martin crashes into the rope.

Martin was stuck headlong on the rope.

Fall on or fall upon

That night I flopped into bed...From all that talking, my tongue was swollen like an eggplant.

That night I fell headfirst onto ...... bedMy tongue swollen like an eggplant due to the endless talking.

Tripped and fell head over heels.

I tripped headlong and fell to the ground.

The, policeman hit the man once with his truncheon, and he went down like a felled ox.

Once the policeman hit the man with his baton, and he fell like a knocked out bull.

A mat of hair.

Messy hair.

fell headlong on the couch".

Head down on the sofa

threw oneself down on the sofa