As if death in and of itself is not eternal?
This is quite important, so let me pause and recall to us that almost everyone (including the Bible) typically refers to
'death' as being that of this temporary mortal body here on Earth, in this life. (though as we know sometimes the word 'dead' is used by Christ to refer to being spiritually alienated from God, so that the Prodigal Son was 'dead' while he was alienated from his Father, and became "alive again" when he repented and returned to his Father.)
But usually by 'dead' everyone means the end of
this life. The temporary one.
That 'death'
isn't a final end to anyone, we know. Because God exists.
God simply moves that spirit of that person to a new place. ( Ecclesiastes 12:7, Luke 8:52, and many more).
I love the account in Luke 8:
49 While Jesus was still speaking, someone from the ruler's house came and said, “Your daughter is
dead; do not trouble the Teacher any more.”
50 But Jesus on hearing this answered him, “Do not fear; only believe, and she will be well.”
51 And when he came to the house, he allowed no one to enter with him, except Peter and John and James, and the father and mother of the child.
52 And all were weeping and mourning for her, but he said, “Do not weep, for she is not dead but sleeping.”
53
And they laughed at him, knowing that she was dead.
54 But taking her by the hand he called, saying, “Child, arise.” 55 And her spirit returned, and she got up at once....
Women Accompanying Jesus - Soon afterward he went on through cities and villages, proclaiming and bringing the good news of the kingdom of God. And the twelve were with him, and also some women who had been healed of evil spirits and infirmities: Mary, called Magdalene, from whom seven demons...
www.biblegateway.com
All 'death' here on Earth is only like 'sleep'....
To answer your main questions
-- None will be asleep later.....
While this question:
Are only these 3 going to be in the lake of fire day and night for ever and ever?
The answer is all who are sent to the
lake of fire will be there -- both all the fallen angels that followed satan, and also all human souls consigned there -- but the human souls there will
perish in that place that is the
second death for humans, and
kills the soul, we read in scripture.
Therefore after some time, only the immortal fallen angels will still exist in the lake of fire, once all of the humans there have perished and been entirely destroyed,
both body and soul.