Belief in the Jinn, witchcraft and the evil eye - Using amulets, and how to deal with nightmares

A friend of mine when he was younger could not sleep as he used to get
nightmares...he was taken by his father to a peer (a holy man) who
made him a necklace with a little box thingy ? which appareblty
contained holy scriptures? is this allowed in islam? & his isnow 24 so
what woudl you recommend for him to do to escape thes nighmares?.
Praise be to Allaah.
Firstly:
It is not permissible to go to fortunetellers and soothsayers and
other such charlatans. Whoever goes to them and asks them about
anything, his prayer will not be accepted for fortydays, and whoever
believes their claim to have knowledge of the unseen or to be able to
relieve hardship and bring benefits is a kaafir,as it says in the
saheeh ahaadeeth narrated from the Prophet (peace and blessings of
Allaah be upon him).
It is not permissible to use turquoise (as a charm) and amulets. A
stern warning is used in the saheeh Sunnah to the one who does that.
It was narrated from 'Uqbah ibn 'Aamir al-Juhani that a group ofpeople
came to the Messenger of Allaah (peace and blessings of Allaah be upon
him), andhe accepted the allegiance of nine and refrained from
accepting the allegiance of one. They said: "O Messenger of Allaah,
youaccepted the allegiance of nine and not this one." He said: "He is
wearing an amulet." He put his hand in and tookit off, then he
accepted his allegiance, and said: "Whoever uses an amulet has
committed shirk (has associated partners with Allaah)." Narrated by
Ahmad, 16969. This hadeeth was classed as saheeh by Shaykh al-Albaani
in al-Silsilah al-Saheehah, 492.
In the answer to question no. 10542 you will find the details of the
ahaadeeth which have been narrated concerning amulets, andthe rulings
of the scholars on amulets containing verses from the Qur'aan and
amulets consisting of other things.
In that answer, Shaykh Sulaymaan ibn 'Abd al-Wahhaab is quoted assaying:
"This scholarly difference was concerning hanging up amulets which
contain Qur'aan or names and attributes of Allaah, so what do you
think aboutthe things which were innovated later on, doing spells
(ruqyah) using the names of shayaateen (devils) and others and hanging
them up, and even beingattached to those shayaateen, seeking refuge in
them, slaughtering animals for them, asking them to ward off harm and
bringbenefits – actions which are pure shirk? This is prevalent among
many of the people, except forthose whom Allaah keeps safe and sound."
And Shaykh Haafiz Hukmi said:
If they (amulets) contain anything other than the two revelations and
instead contain mumbo-jumbo from the Jews or worshippers of the
temple, stars or angels, or those who use the services of the jinn,
etc., or they are made of pearls, strings, iron rings, etc., then this
is shirk, i.e., hanging them up or wearing them is shirk, beyond a
doubt.
Secondly:
In the answer to question no. 9577 you will find some means of
protection against nightmares and disturbing dreams.
And Allaah knows best.