The soft, calming pink light emitted by salt lamps may be more helpful in decreasing nighttime exposure to blue light, such as the light you find in your cell phone, computer or tablet. Blue light may reduce the quality of your sleep as well as your cognitive performance the following morning (Hatori, et. al, 2017). At nighttime, the pink glow from a salt lamp may be better on your eyes than other types of artificial light.
A Himalayan salt lamp is a lamp formed from natural Himalayan salt and absorbs water and particles from the air. It removes negative ions, and replaces them with positive ions, while  purifying  the air and keeping your lungs clear. Salt crystal is perfect for those with allergy sensitivity, as the salt lamps work to purify the air and emit ions for better air quality. The light glow of the lamp itself creates a calming sensation that is perfect for rejuvenation, relaxation and reflection.
 There are two main arguments one could make to suggest negative ions increase oxygen flow to the brain or provide you with more energy. The first one is that negative ions increase respiratory function and, as a consequence, would allow your body to deliver more oxygen overall. This claim, though oft repeated, has very little evidence to support it. A 2013 systematic review of papers investigating a relationship between exposure to ions and respiratory health stated:
We at originsalt have so many satisfied customers who say that this lamp has changed their life, so we definitely believe that there is more than what we know behind them. Every day people write on our wall how the Himalayan Salt Lamp has helped them for their allergy, asthma, sinus problems, sleep problems and so on. Even if you think that this lamp is not working, it is still a better solution than an ordinary lamp. The light from a real Himalayan Salt Lamp is really calming and relaxing and you can adjust the light, which is also great. So my suggestion for you would be to test and see by yourself, may be this is what you need.
These negative ions occur in nature via the effects of water, air, and sunlight. Have you ever gone for a hike through the mountains or near a waterfall only to feel rejuvenated? Negative ions are partly to thank for that wonderful feeling. Nature has the ability to heal, and proponents of Himalayan salt lamps argue these pink salt rocks can mimic, to an extent, the feeling you get from being outside.
I appreciate the talents of writers to be able to express that which I myself struggle with to translate into words. One paragraph cannot begin to encompass the substance and specifics of how, when and exact dilution methods, methods of delivery, etc. Blue8Ball is spot on regarding the adverse consequences resulting from misuse of essential oils as well as the nonsense being peddled by greedy uninformed or (even worse, lacking a conscience ) entrepreneurs that excel at sales and marketing. I too, find it frustrating to arrive at the end of an article only to feel mislead by headlines. Sometimes I wonder if the authors of these articles choose the words used to catch our attention in the headlines, and if not, does the individual who does feel any sense of responsibility for integrity?
No consistent influence of positive or negative air ionization on anxiety, mood, relaxation, sleep, and personal comfort measures was observed. Negative air ionization was associated with lower depression scores particularly at the highest exposure level. Future research is needed to evaluate the biological plausibility of this association. Source: Air ions and mood outcomes: a review and meta-analysis.  
Like several comments above, I also smelled something burning one night in my office and couldn’t figure out what was the culprit for awhile. When I located the source of the problem and tried to turn off the salt lamp, I almost burned my hand by touching the dimmer/switch. As you can see from the photo, part of it was melted. Glad I was there that night. Or my office would have been on fire!