A "drunken drugged up yob" bit the ear and nose of a 56-year-old man in a random attack after banging on his door in the early hours of the morning.
Liam Powell, 30, had downed 40 cans of cider and had smoked 10 cannabis spliffs while watching rugby with friends on the day of the attack.
The victim Michael Harris and his partner Deborah York were asleep at when Powell banged on the door of their home in Cwmbran at 3.30am on February 23, calling out "Ginge, Ginge".
When Powell refused to leave the property Mr Harris went downstairs and opened the door but the defendant pushed past him and proceeded to unleash a ferocious attack.
Speaking at a sentencing hearing at Cardiff Crown Court on Friday, prosecutor Meirion Davies said: "Mr Harris was punched to the left eye which caused him to wobble and lose his balance and a scuffle ensued.
"Mr Harris and the defendant fell to the floor outside with the defendant on top. He repeatedly punched Mr Harris to the face before biting his left ear and his nose.
"The defendant then got up and Mr Harris' head three times. That was witnessed by Deborah York who had retrieved her phone and called the police.
"The defendant made off in the direction of a neighbouring road and police officers attended the scene administering first."
Mr Harris attended hospital where he received treatment to a laceration to his left ear but it is not known to what extent he was injured.
In a victim personal statement read out to the court, Mr Harris said: "I am dreading going to bed as I am unsure I will be able to get to sleep.
"I am fearful because my partner's grandchildren come to stay often and I am sure it's not safe enough to stay here any longer.
"I am in a great deal of pain and I have a long road to recovery ahead with not only my physical injuries but anxiety.
"I should be able to feel safe in my own home but I am not sure I will be able to stay here and we have discussed moving house."
Powell was later identified by a neighbour and his nearby home was raided by police where they discovered the defendant with cuts all over his body and dried blood on his nose.
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He was arrested and taken to a police station where he was interviewed later that day. He told officers he had no memory of that evening due to his level of intoxication.
When police showed him the injuries caused to Mr Harris, the defendant became tearful and said "I can't believe that was me".
Defence barrister Karl Williams said his client was "extremely remorseful" about his actions and was "ashamed" about what he had done.
He said Powell had been suffering with depression and had been drinking eight cans of cider a day but the "ridiculous" amount of alcohol and drugs he had taken on that day had placed him in a position where he "remembers very little".
Sentencing, Patrick Harrington QC said: "Drugs are a scourge on society and people think that smoking cannabis is recreational but it's an evil poison which poisons people's heads and poisons people's actions and it had got you into this wretched mess.
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"Do you think if your parents were at home and some drunken, drugged up yob came knocking at their door at 3.30am, attacked a 56-year-old man by punching, stamping and biting them, your parents would stand outside this court complaining the sentence was not long enough.
"Well that won't happen to the victims in this case.
"Random actions of this sort are appalling. (Mr Harris) will never forget it and he'll never go to bed without thinking will another drunken yob knock on my door tonight.
"He had his life changed because you were drunk and spliffled up and it's appalling."
Powell, now of Woodland Road, Tylorstown, Ferndale, was sentenced to four years and eight months imprisonment.
