Yes, there are lying spirits. Plus 'And no marvel; for Satan himself is transformed into an angel of light (Ii Cor 4:11).
However,, the Lord can and does use experiences. "I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth such an one caught up to the third heaven." II Cor 12:2 A Biblical account of an out of body experience was Philip and the eunich in Acts 8 "And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing. But Philip was found at Azotus: and passing through he preached in all the cities, till he came to Caesarea."
Some NDEs report that they were told it wasnt their time yet and there was a boundary in place. These are supported in Scripture. In Luk 16, there is an account between Father Abraham and Lazarus. "And besides all this, between us and you a great chasm has been fixed, so that those who want to go from here to you cannot, nor can anyone cross over from there to us.' v26 Plus we're here until our days are fulfilled. Yahweh determines the time and place of our births: “And he made from one man every race of men to live on all the face of the earth, having determined allotted epochs and the fixed boundaries of the places where they would live;” (Acts 17:26) Here's another one about both. "Seeing his days are determined, the number of his months are with thee, thou hast appointed his bounds that he cannot pass;" Job 14
Many believe someone is dead when they meet the medical definition, the natural one. But it's also spiritual. We're spirit, soul, and body (KJV, I Thess 5:23) For believers, "We are confident, I say, and willing rather
to be absent from the body, and to be present with the Lord." (II Cor 5:8). Death is when both the spirit and soul leave the body
permanently - "For as the body without the spirit is dead,..." (
James 2:26).
One problem is some discount all NDEs and out-of body experiences while others accept all. We can asks God. We can asks for the discernment of spirits. As tellyontellyon posted, I've read accounts where these experiences resulted in them becoming followers of Jesus
Very important Not encouraging anyone to pursue these on their own initiative. There's so much about the spirit world we don't know. But when the Lord does it - Everything the Lord does has a purpose. It may take awhile to process once these are experienced. But the key is to whether ithese experiences are from the Lord, do they point to Him?